661010264 has 16 divisors (see below), whose sum is σ = 1239861600. Its totient is φ = 330380512.

The previous prime is 661010263. The next prime is 661010267. The reversal of 661010264 is 462010166.

It is a happy number.

It is a super-2 number, since 2×661010264² = 873869138226699392, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661010263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9302 + ... + 37530.

It is an arithmetic number, because the mean of its divisors is an integer number (77491350).

Almost surely, 2^661010264 is an apocalyptic number.

It is an amenable number.

661010264 is a deficient number, since it is larger than the sum of its proper divisors (578851336).

661010264 is a wasteful number, since it uses less digits than its factorization.

661010264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31162 (or 31158 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 661010264 is about 25710.1198752553. The cubic root of 661010264 is about 871.1027826488.

It can be divided in two parts, 6610102 and 64, that added together give a palindrome (6610166).

The spelling of 661010264 in words is "six hundred sixty-one million, ten thousand, two hundred sixty-four".