70661243 has 4 divisors (see below), whose sum is σ = 71994528. Its totient is φ = 69327960.

The previous prime is 70661233. The next prime is 70661249. The reversal of 70661243 is 34216607.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34216607 = 29 ⋅1179883.

It is a cyclic number.

It is not a de Polignac number, because 70661243 - 2¹⁸ = 70399099 is a prime.

It is a super-2 number, since 2×70661243² = 9986022524610098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70661249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666563 + ... + 666668.

It is an arithmetic number, because the mean of its divisors is an integer number (17998632).

Almost surely, 2^70661243 is an apocalyptic number.

70661243 is a deficient number, since it is larger than the sum of its proper divisors (1333285).

70661243 is a wasteful number, since it uses less digits than its factorization.

70661243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333284.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 70661243 is about 8406.0242088635. The cubic root of 70661243 is about 413.4221656250.

The spelling of 70661243 in words is "seventy million, six hundred sixty-one thousand, two hundred forty-three".