521861507148 has 24 divisors (see below), whose sum is σ = 1226437119040. Its totient is φ = 172702368720.

The previous prime is 521861507131. The next prime is 521861507149. The reversal of 521861507148 is 841705168125.

It is a junction number, because it is equal to n+sod(n) for n = 521861507097 and 521861507106.

It is not an unprimeable number, because it can be changed into a prime (521861507149) 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, 156431638 + ... + 156434973.

Almost surely, 2^521861507148 is an apocalyptic number.

It is an amenable number.

521861507148 is an abundant number, since it is smaller than the sum of its proper divisors (704575611892).

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

521861507148 is a wasteful number, since it uses less digits than its factorization.

521861507148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312866757 (or 312866755 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 48.

The spelling of 521861507148 in words is "five hundred twenty-one billion, eight hundred sixty-one million, five hundred seven thousand, one hundred forty-eight".