1975181664 has 48 divisors (see below), whose sum is σ = 5210956800. Its totient is φ = 655079040.

The previous prime is 1975181653. The next prime is 1975181671. The reversal of 1975181664 is 4661815791.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32592 + ... + 70799.

It is an arithmetic number, because the mean of its divisors is an integer number (108561600).

Almost surely, 2^1975181664 is an apocalyptic number.

It is an amenable number.

1975181664 is an abundant number, since it is smaller than the sum of its proper divisors (3235775136).

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

1975181664 is a wasteful number, since it uses less digits than its factorization.

1975181664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103603 (or 103595 counting only the distinct ones).

The product of its digits is 362880, while the sum is 48.

The square root of 1975181664 is about 44443.0159192645. The cubic root of 1975181664 is about 1254.6878191574.

The spelling of 1975181664 in words is "one billion, nine hundred seventy-five million, one hundred eighty-one thousand, six hundred sixty-four".