661507342407 has 32 divisors (see below), whose sum is σ = 981468533760. Its totient is φ = 440349436800.

The previous prime is 661507342403. The next prime is 661507342453. The reversal of 661507342407 is 704243705166.

661507342407 is a `hidden beast` number, since 6 + 6 + 150 + 73 + 424 + 0 + 7 = 666.

It is not a de Polignac number, because 661507342407 - 2² = 661507342403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661507342403) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64893103 + ... + 64903295.

It is an arithmetic number, because the mean of its divisors is an integer number (30670891680).

Almost surely, 2^661507342407 is an apocalyptic number.

661507342407 is a deficient number, since it is larger than the sum of its proper divisors (319961191353).

661507342407 is a wasteful number, since it uses less digits than its factorization.

661507342407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13540 (or 13534 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 45.

The spelling of 661507342407 in words is "six hundred sixty-one billion, five hundred seven million, three hundred forty-two thousand, four hundred seven".