661515150 has 24 divisors (see below), whose sum is σ = 1640557944. Its totient is φ = 176404000.

The previous prime is 661515137. The next prime is 661515181. The reversal of 661515150 is 51515166.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2204901 + ... + 2205200.

It is an arithmetic number, because the mean of its divisors is an integer number (68356581).

Almost surely, 2^661515150 is an apocalyptic number.

661515150 is an abundant number, since it is smaller than the sum of its proper divisors (979042794).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661515150 is a wasteful number, since it uses less digits than its factorization.

661515150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4410116 (or 4410111 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 30.

The square root of 661515150 is about 25719.9368195180. The cubic root of 661515150 is about 871.3245117679.

The spelling of 661515150 in words is "six hundred sixty-one million, five hundred fifteen thousand, one hundred fifty".