661534266215624 has 64 divisors (see below), whose sum is σ = 1272448050720000. Its totient is φ = 322254575302464.

The previous prime is 661534266215609. The next prime is 661534266215629. The reversal of 661534266215624 is 426512662435166.

661534266215624 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (661534266215629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 319449659 + ... + 321513845.

It is an arithmetic number, because the mean of its divisors is an integer number (19882000792500).

Almost surely, 2^{661534266215624} is an apocalyptic number.

It is an amenable number.

661534266215624 is a deficient number, since it is larger than the sum of its proper divisors (610913784504376).

661534266215624 is a wasteful number, since it uses less digits than its factorization.

661534266215624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2066602 (or 2066598 counting only the distinct ones).

The product of its digits is 74649600, while the sum is 59.

The spelling of 661534266215624 in words is "six hundred sixty-one trillion, five hundred thirty-four billion, two hundred sixty-six million, two hundred fifteen thousand, six hundred twenty-four".