157821057788 has 24 divisors (see below), whose sum is σ = 278848713024. Its totient is φ = 78152672000.

The previous prime is 157821057787. The next prime is 157821057803. The reversal of 157821057788 is 887750128751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157821057781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97913 + ... + 570288.

It is an arithmetic number, because the mean of its divisors is an integer number (11618696376).

Almost surely, 2^157821057788 is an apocalyptic number.

It is an amenable number.

157821057788 is a deficient number, since it is larger than the sum of its proper divisors (121027655236).

157821057788 is a wasteful number, since it uses less digits than its factorization.

157821057788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668773 (or 668771 counting only the distinct ones).

The product of its (nonzero) digits is 8780800, while the sum is 59.

The spelling of 157821057788 in words is "one hundred fifty-seven billion, eight hundred twenty-one million, fifty-seven thousand, seven hundred eighty-eight".