661010516 has 6 divisors (see below), whose sum is σ = 1156768410. Its totient is φ = 330505256.

The previous prime is 661010479. The next prime is 661010521. The reversal of 661010516 is 615010166.

It can be written as a sum of positive squares in only one way, i.e., 647906116 + 13104400 = 25454^2 + 3620^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82626311 + ... + 82626318.

It is an arithmetic number, because the mean of its divisors is an integer number (192794735).

Almost surely, 2^661010516 is an apocalyptic number.

It is an amenable number.

661010516 is a deficient number, since it is larger than the sum of its proper divisors (495757894).

661010516 is a wasteful number, since it uses less digits than its factorization.

661010516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165252633 (or 165252631 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 661010516 is about 25710.1247760488. The cubic root of 661010516 is about 871.1028933470.

The spelling of 661010516 in words is "six hundred sixty-one million, ten thousand, five hundred sixteen".