72001155591 has 48 divisors (see below), whose sum is σ = 105845096448. Its totient is φ = 47159884800.

The previous prime is 72001155533. The next prime is 72001155617. The reversal of 72001155591 is 19555110027.

72001155591 is a `hidden beast` number, since 7 + 2 + 0 + 0 + 11 + 55 + 591 = 666.

It is not a de Polignac number, because 72001155591 - 2¹³ = 72001147399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72001155091) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 59162215 + ... + 59163431.

It is an arithmetic number, because the mean of its divisors is an integer number (2205106176).

Almost surely, 2^72001155591 is an apocalyptic number.

72001155591 is a deficient number, since it is larger than the sum of its proper divisors (33843940857).

72001155591 is a wasteful number, since it uses less digits than its factorization.

72001155591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1812 (or 1809 counting only the distinct ones).

The product of its (nonzero) digits is 15750, while the sum is 36.

The spelling of 72001155591 in words is "seventy-two billion, one million, one hundred fifty-five thousand, five hundred ninety-one".