661465156 has 12 divisors (see below), whose sum is σ = 1262797200. Its totient is φ = 300665960.

The previous prime is 661465117. The next prime is 661465157. The reversal of 661465156 is 651564166.

It is not an unprimeable number, because it can be changed into a prime (661465157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7516606 + ... + 7516693.

It is an arithmetic number, because the mean of its divisors is an integer number (105233100).

Almost surely, 2^661465156 is an apocalyptic number.

It is an amenable number.

661465156 is a deficient number, since it is larger than the sum of its proper divisors (601332044).

661465156 is a wasteful number, since it uses less digits than its factorization.

661465156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15033314 (or 15033312 counting only the distinct ones).

The product of its digits is 129600, while the sum is 40.

The square root of 661465156 is about 25718.9649091872. The cubic root of 661465156 is about 871.3025611015.

The spelling of 661465156 in words is "six hundred sixty-one million, four hundred sixty-five thousand, one hundred fifty-six".