661036248695664 has 60 divisors (see below), whose sum is σ = 1958805942833376. Its totient is φ = 207383921158656.

The previous prime is 661036248695651. The next prime is 661036248695699. The reversal of 661036248695664 is 466596842630166.

661036248695664 is a `hidden beast` number, since 6 + 6 + 1 + 0 + 36 + 2 + 486 + 9 + 56 + 64 = 666.

661036248695664 is digitally balanced in base 2, because in such base 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 (72).

It is a junction number, because it is equal to n+sod(n) for n = 661036248695592 and 661036248695601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 135015571224 + ... + 135015576119.

Almost surely, 2^{661036248695664} is an apocalyptic number.

It is an amenable number.

661036248695664 is an abundant number, since it is smaller than the sum of its proper divisors (1297769694137712).

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

661036248695664 is a wasteful number, since it uses less digits than its factorization.

661036248695664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270031147374 (or 270031147365 counting only the distinct ones).

The product of its (nonzero) digits is 1612431360, while the sum is 72.

The spelling of 661036248695664 in words is "six hundred sixty-one trillion, thirty-six billion, two hundred forty-eight million, six hundred ninety-five thousand, six hundred sixty-four".