660653964894 has 32 divisors (see below), whose sum is σ = 1647344952576. Its totient is φ = 171598432320.

The previous prime is 660653964787. The next prime is 660653964941. The reversal of 660653964894 is 498469356066.

It is a super-2 number, since 2×660653964894² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a Curzon number.

It is a congruent number.

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, 714993007 + ... + 714993930.

It is an arithmetic number, because the mean of its divisors is an integer number (51479529768).

Almost surely, 2^660653964894 is an apocalyptic number.

660653964894 is an abundant number, since it is smaller than the sum of its proper divisors (986690987682).

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

660653964894 is a wasteful number, since it uses less digits than its factorization.

660653964894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1429986960.

The product of its (nonzero) digits is 201553920, while the sum is 66.

The spelling of 660653964894 in words is "six hundred sixty billion, six hundred fifty-three million, nine hundred sixty-four thousand, eight hundred ninety-four".