157706107231778 has 48 divisors (see below), whose sum is σ = 284733111998520. Its totient is φ = 65243247100416.

The previous prime is 157706107231721. The next prime is 157706107231787. The reversal of 157706107231778 is 877132701607751.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 117687413714689 + 40018693517089 = 10848383^2 + 6326033^2 .

It is a super-2 number, since 2×157706107231778² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 157706107231778.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6694826 + ... + 18979802.

Almost surely, 2^{157706107231778} is an apocalyptic number.

157706107231778 is a deficient number, since it is larger than the sum of its proper divisors (127027004766742).

157706107231778 is a wasteful number, since it uses less digits than its factorization.

157706107231778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12289539 (or 12289532 counting only the distinct ones).

The product of its (nonzero) digits is 24202080, while the sum is 62.

The spelling of 157706107231778 in words is "one hundred fifty-seven trillion, seven hundred six billion, one hundred seven million, two hundred thirty-one thousand, seven hundred seventy-eight".