72651666106651 has 4 divisors (see below), whose sum is σ = 74615224650112. Its totient is φ = 70688107563192.

The previous prime is 72651666106597. The next prime is 72651666106661. The reversal of 72651666106651 is 15660166615627.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72651666106651 - 2¹¹ = 72651666104603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72651666106661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 981779271675 + ... + 981779271748.

It is an arithmetic number, because the mean of its divisors is an integer number (18653806162528).

Almost surely, 2^{72651666106651} is an apocalyptic number.

72651666106651 is a deficient number, since it is larger than the sum of its proper divisors (1963558543461).

72651666106651 is a wasteful number, since it uses less digits than its factorization.

72651666106651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1963558543460.

The product of its (nonzero) digits is 16329600, while the sum is 58.

The spelling of 72651666106651 in words is "seventy-two trillion, six hundred fifty-one billion, six hundred sixty-six million, one hundred six thousand, six hundred fifty-one".