671825731665 has 64 divisors (see below), whose sum is σ = 1236288614400. Its totient is φ = 308107468800.

The previous prime is 671825731649. The next prime is 671825731673. The reversal of 671825731665 is 566137528176.

671825731665 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 not a de Polignac number, because 671825731665 - 2⁴ = 671825731649 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1842376 + ... + 2176694.

It is an arithmetic number, because the mean of its divisors is an integer number (19317009600).

Almost surely, 2^671825731665 is an apocalyptic number.

It is an amenable number.

671825731665 is a deficient number, since it is larger than the sum of its proper divisors (564462882735).

671825731665 is a wasteful number, since it uses less digits than its factorization.

671825731665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334998.

The product of its digits is 12700800, while the sum is 57.

The spelling of 671825731665 in words is "six hundred seventy-one billion, eight hundred twenty-five million, seven hundred thirty-one thousand, six hundred sixty-five".