72178340685355 has 16 divisors (see below), whose sum is σ = 89628091819200. Its totient is φ = 55734501352320.

The previous prime is 72178340685331. The next prime is 72178340685403. The reversal of 72178340685355 is 55358604387127.

It is a happy number.

It is not a de Polignac number, because 72178340685355 - 2⁹ = 72178340684843 is a prime.

It is a super-2 number, since 2×72178340685355² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75615840 + ... + 76564429.

It is an arithmetic number, because the mean of its divisors is an integer number (5601755738700).

Almost surely, 2^{72178340685355} is an apocalyptic number.

72178340685355 is a deficient number, since it is larger than the sum of its proper divisors (17449751133845).

72178340685355 is a wasteful number, since it uses less digits than its factorization.

72178340685355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152183574.

The product of its (nonzero) digits is 169344000, while the sum is 64.

The spelling of 72178340685355 in words is "seventy-two trillion, one hundred seventy-eight billion, three hundred forty million, six hundred eighty-five thousand, three hundred fifty-five".