661501052 has 24 divisors (see below), whose sum is σ = 1187056752. Its totient is φ = 322358400.

The previous prime is 661501051. The next prime is 661501063. The reversal of 661501052 is 250105166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661501051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 281402 + ... + 283742.

It is an arithmetic number, because the mean of its divisors is an integer number (49460698).

Almost surely, 2^661501052 is an apocalyptic number.

It is an amenable number.

661501052 is a deficient number, since it is larger than the sum of its proper divisors (525555700).

661501052 is a wasteful number, since it uses less digits than its factorization.

661501052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4109 (or 4107 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 661501052 is about 25719.6627505106. The cubic root of 661501052 is about 871.3183219272.

The spelling of 661501052 in words is "six hundred sixty-one million, five hundred one thousand, fifty-two".