157122988978 has 8 divisors (see below), whose sum is σ = 235691383680. Its totient is φ = 78559194420.

The previous prime is 157122988973. The next prime is 157122989003. The reversal of 157122988978 is 879889221751.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (157122988973) 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, 1063338 + ... + 1202053.

It is an arithmetic number, because the mean of its divisors is an integer number (29461422960).

Almost surely, 2^157122988978 is an apocalyptic number.

157122988978 is a deficient number, since it is larger than the sum of its proper divisors (78568394702).

157122988978 is a wasteful number, since it uses less digits than its factorization.

157122988978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2300072.

The product of its digits is 40642560, while the sum is 67.

The spelling of 157122988978 in words is "one hundred fifty-seven billion, one hundred twenty-two million, nine hundred eighty-eight thousand, nine hundred seventy-eight".