661201152 has 36 divisors (see below), whose sum is σ = 1759761360. Its totient is φ = 220400128.

The previous prime is 661201133. The next prime is 661201169. The reversal of 661201152 is 251102166.

It is a super-2 number, since 2×661201152² = 874373926812254208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 429702 + ... + 431237.

It is an arithmetic number, because the mean of its divisors is an integer number (48882260).

Almost surely, 2^661201152 is an apocalyptic number.

It is an amenable number.

661201152 is an abundant number, since it is smaller than the sum of its proper divisors (1098560208).

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

661201152 is an equidigital number, since it uses as much as digits as its factorization.

661201152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860958 (or 860944 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 661201152 is about 25713.8319198053. The cubic root of 661201152 is about 871.1866275718.

The spelling of 661201152 in words is "six hundred sixty-one million, two hundred one thousand, one hundred fifty-two".