2158723651 has 8 divisors (see below), whose sum is σ = 2492547680. Its totient is φ = 1831258368.

The previous prime is 2158723649. The next prime is 2158723667. The reversal of 2158723651 is 1563278512.

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

It is a cyclic number.

It is not a de Polignac number, because 2158723651 - 2¹ = 2158723649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2158723691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1588956 + ... + 1590313.

It is an arithmetic number, because the mean of its divisors is an integer number (311568460).

Almost surely, 2^2158723651 is an apocalyptic number.

2158723651 is a deficient number, since it is larger than the sum of its proper divisors (333824029).

2158723651 is an equidigital number, since it uses as much as digits as its factorization.

2158723651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3179373.

The product of its digits is 100800, while the sum is 40.

The square root of 2158723651 is about 46462.0667964739. The cubic root of 2158723651 is about 1292.4061517633.

The spelling of 2158723651 in words is "two billion, one hundred fifty-eight million, seven hundred twenty-three thousand, six hundred fifty-one".