672551660721 has 16 divisors (see below), whose sum is σ = 911501396288. Its totient is φ = 440985902400.

The previous prime is 672551660689. The next prime is 672551660761. The reversal of 672551660721 is 127066155276.

It is not a de Polignac number, because 672551660721 - 2⁵ = 672551660689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (672551660761) 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, 2583666 + ... + 2832036.

It is an arithmetic number, because the mean of its divisors is an integer number (56968837268).

Almost surely, 2^672551660721 is an apocalyptic number.

672551660721 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

672551660721 is a deficient number, since it is larger than the sum of its proper divisors (238949735567).

672551660721 is a wasteful number, since it uses less digits than its factorization.

672551660721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263232.

The product of its (nonzero) digits is 1058400, while the sum is 48.

The spelling of 672551660721 in words is "six hundred seventy-two billion, five hundred fifty-one million, six hundred sixty thousand, seven hundred twenty-one".