661507212948 has 24 divisors (see below), whose sum is σ = 1545859059360. Its totient is φ = 220167800160.

The previous prime is 661507212931. The next prime is 661507212967. The reversal of 661507212948 is 849212705166.

It is a self number, because there is not a number n which added to its sum of digits gives 661507212948.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41817283 + ... + 41833098.

It is an arithmetic number, because the mean of its divisors is an integer number (64410794140).

Almost surely, 2^661507212948 is an apocalyptic number.

It is an amenable number.

661507212948 is an abundant number, since it is smaller than the sum of its proper divisors (884351846412).

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

661507212948 is a wasteful number, since it uses less digits than its factorization.

661507212948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83651047 (or 83651045 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 51.

The spelling of 661507212948 in words is "six hundred sixty-one billion, five hundred seven million, two hundred twelve thousand, nine hundred forty-eight".