57661433431 has 4 divisors (see below), whose sum is σ = 65898781072. Its totient is φ = 49424085792.

The previous prime is 57661433419. The next prime is 57661433437. The reversal of 57661433431 is 13433416675.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 57661433431 - 2¹¹ = 57661431383 is a prime.

It is a super-2 number, since 2×57661433431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57661433437) 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, 4118673810 + ... + 4118673823.

It is an arithmetic number, because the mean of its divisors is an integer number (16474695268).

Almost surely, 2^57661433431 is an apocalyptic number.

57661433431 is a deficient number, since it is larger than the sum of its proper divisors (8237347641).

57661433431 is an equidigital number, since it uses as much as digits as its factorization.

57661433431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8237347640.

The product of its digits is 544320, while the sum is 43.

The spelling of 57661433431 in words is "fifty-seven billion, six hundred sixty-one million, four hundred thirty-three thousand, four hundred thirty-one".