661373000 has 32 divisors (see below), whose sum is σ = 1547615160. Its totient is φ = 264548800.

The previous prime is 661372997. The next prime is 661373021. The reversal of 661373000 is 373166.

It can be written as a sum of positive squares in 4 ways, for example, as 95218564 + 566154436 = 9758^2 + 23794^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 329687 + ... + 331686.

Almost surely, 2^661373000 is an apocalyptic number.

It is an amenable number.

661373000 is an abundant number, since it is smaller than the sum of its proper divisors (886242160).

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

661373000 is a wasteful number, since it uses less digits than its factorization.

661373000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661394 (or 661380 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 26.

The square root of 661373000 is about 25717.1732505732. The cubic root of 661373000 is about 871.2620956352.

The spelling of 661373000 in words is "six hundred sixty-one million, three hundred seventy-three thousand".