72018673557 has 16 divisors (see below), whose sum is σ = 101602580160. Its totient is φ = 45249795072.

The previous prime is 72018673553. The next prime is 72018673567. The reversal of 72018673557 is 75537681027.

It is not a de Polignac number, because 72018673557 - 2² = 72018673553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72018673553) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3262278 + ... + 3284279.

It is an arithmetic number, because the mean of its divisors is an integer number (6350161260).

Almost surely, 2^72018673557 is an apocalyptic number.

It is an amenable number.

72018673557 is a deficient number, since it is larger than the sum of its proper divisors (29583906603).

72018673557 is a wasteful number, since it uses less digits than its factorization.

72018673557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6546772.

The product of its (nonzero) digits is 2469600, while the sum is 51.

The spelling of 72018673557 in words is "seventy-two billion, eighteen million, six hundred seventy-three thousand, five hundred fifty-seven".