157821159780 has 120 divisors (see below), whose sum is σ = 507166422840. Its totient is φ = 41059146240.

The previous prime is 157821159779. The next prime is 157821159809. The reversal of 157821159780 is 87951128751.

157821159780 is a `hidden beast` number, since 1 + 578 + 2 + 11 + 59 + 7 + 8 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 205807716 + 157615352064 = 14346^2 + 397008^2 .

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1121635 + ... + 1254474.

It is an arithmetic number, because the mean of its divisors is an integer number (4226386857).

Almost surely, 2^157821159780 is an apocalyptic number.

157821159780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

157821159780 is an abundant number, since it is smaller than the sum of its proper divisors (349345263060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

157821159780 is a wasteful number, since it uses less digits than its factorization.

157821159780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2376171 (or 2376160 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 54.

The spelling of 157821159780 in words is "one hundred fifty-seven billion, eight hundred twenty-one million, one hundred fifty-nine thousand, seven hundred eighty".