661252702515 has 48 divisors (see below), whose sum is σ = 1124262931680. Its totient is φ = 331815976960.

The previous prime is 661252702489. The next prime is 661252702519. The reversal of 661252702515 is 515207252166.

It is not a de Polignac number, because 661252702515 - 2⁷ = 661252702387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661252702519) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14408305 + ... + 14454125.

It is an arithmetic number, because the mean of its divisors is an integer number (23422144410).

Almost surely, 2^661252702515 is an apocalyptic number.

661252702515 is a deficient number, since it is larger than the sum of its proper divisors (463010229165).

661252702515 is a wasteful number, since it uses less digits than its factorization.

661252702515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49192 (or 49175 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 42.

The spelling of 661252702515 in words is "six hundred sixty-one billion, two hundred fifty-two million, seven hundred two thousand, five hundred fifteen".