157661751 has 8 divisors (see below), whose sum is σ = 226386160. Its totient is φ = 97022592.

The previous prime is 157661731. The next prime is 157661771. The reversal of 157661751 is 157166751.

It is an interprime number because it is at equal distance from previous prime (157661731) and next prime (157661771).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 157661751 - 2¹⁷ = 157530679 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 4042609 = 157661751 / (1 + 5 + 7 + 6 + 6 + 1 + 7 + 5 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157661701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2021266 + ... + 2021343.

It is an arithmetic number, because the mean of its divisors is an integer number (28298270).

Almost surely, 2^157661751 is an apocalyptic number.

157661751 is a deficient number, since it is larger than the sum of its proper divisors (68724409).

157661751 is a wasteful number, since it uses less digits than its factorization.

157661751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4042625.

The product of its digits is 44100, while the sum is 39.

The square root of 157661751 is about 12556.3430583908. The cubic root of 157661751 is about 540.2259582486.

The spelling of 157661751 in words is "one hundred fifty-seven million, six hundred sixty-one thousand, seven hundred fifty-one".