72166205215610 has 64 divisors (see below), whose sum is σ = 141877069741440. Its totient is φ = 26210996977920.

The previous prime is 72166205215547. The next prime is 72166205215631. The reversal of 72166205215610 is 1651250266127.

It is a super-2 number, since 2×72166205215610² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 379733132 + ... + 379923128.

It is an arithmetic number, because the mean of its divisors is an integer number (2216829214710).

Almost surely, 2^{72166205215610} is an apocalyptic number.

72166205215610 is a deficient number, since it is larger than the sum of its proper divisors (69710864525830).

72166205215610 is a wasteful number, since it uses less digits than its factorization.

72166205215610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194111.

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 72166205215610 in words is "seventy-two trillion, one hundred sixty-six billion, two hundred five million, two hundred fifteen thousand, six hundred ten".