661954080 has 48 divisors (see below), whose sum is σ = 2085156864. Its totient is φ = 176520960.

The previous prime is 661954039. The next prime is 661954103. The reversal of 661954080 is 80459166.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 689056 + ... + 690015.

It is an arithmetic number, because the mean of its divisors is an integer number (43440768).

Almost surely, 2^661954080 is an apocalyptic number.

661954080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

661954080 is an abundant number, since it is smaller than the sum of its proper divisors (1423202784).

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

661954080 is a wasteful number, since it uses less digits than its factorization.

661954080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379089 (or 1379081 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 661954080 is about 25728.4682793205. The cubic root of 661954080 is about 871.5171835512.

The spelling of 661954080 in words is "six hundred sixty-one million, nine hundred fifty-four thousand, eighty".