157158729778 has 4 divisors (see below), whose sum is σ = 235738094670. Its totient is φ = 78579364888.

The previous prime is 157158729701. The next prime is 157158729779. The reversal of 157158729778 is 877927851751.

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

It can be written as a sum of positive squares in only one way, i.e., 89070611809 + 68088117969 = 298447^2 + 260937^2 .

It is not an unprimeable number, because it can be changed into a prime (157158729779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39289682443 + ... + 39289682446.

Almost surely, 2^157158729778 is an apocalyptic number.

157158729778 is a deficient number, since it is larger than the sum of its proper divisors (78579364892).

157158729778 is an equidigital number, since it uses as much as digits as its factorization.

157158729778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78579364891.

The product of its digits is 69148800, while the sum is 67.

The spelling of 157158729778 in words is "one hundred fifty-seven billion, one hundred fifty-eight million, seven hundred twenty-nine thousand, seven hundred seventy-eight".