661153252452 has 48 divisors (see below), whose sum is σ = 1923354918912. Its totient is φ = 171728117280.

The previous prime is 661153252391. The next prime is 661153252489. The reversal of 661153252452 is 254252351166.

661153252452 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 357765988 + ... + 357767835.

It is an arithmetic number, because the mean of its divisors is an integer number (40069894144).

Almost surely, 2^661153252452 is an apocalyptic number.

It is an amenable number.

661153252452 is an abundant number, since it is smaller than the sum of its proper divisors (1262201666460).

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

661153252452 is a wasteful number, since it uses less digits than its factorization.

661153252452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715533848 (or 715533846 counting only the distinct ones).

The product of its digits is 432000, while the sum is 42.

The spelling of 661153252452 in words is "six hundred sixty-one billion, one hundred fifty-three million, two hundred fifty-two thousand, four hundred fifty-two".