661488070000 has 50 divisors (see below), whose sum is σ = 1601528790488. Its totient is φ = 264595224000.

The previous prime is 661488069959. The next prime is 661488070091. The reversal of 661488070000 is 70884166.

It is a tau number, because it is divible by the number of its divisors (50).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 33064404 + ... + 33084403.

Almost surely, 2^661488070000 is an apocalyptic number.

It is an amenable number.

661488070000 is an abundant number, since it is smaller than the sum of its proper divisors (940040720488).

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

661488070000 is an equidigital number, since it uses as much as digits as its factorization.

661488070000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66148835 (or 66148814 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The spelling of 661488070000 in words is "six hundred sixty-one billion, four hundred eighty-eight million, seventy thousand".