72506155171 has 2 divisors, whose sum is σ = 72506155172. Its totient is φ = 72506155170.

The previous prime is 72506155157. The next prime is 72506155177. The reversal of 72506155171 is 17155160527.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72506155171 - 2²³ = 72497766563 is a prime.

It is a super-2 number, since 2×72506155171² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72506155177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36253077585 + 36253077586.

It is an arithmetic number, because the mean of its divisors is an integer number (36253077586).

Almost surely, 2^72506155171 is an apocalyptic number.

72506155171 is a deficient number, since it is larger than the sum of its proper divisors (1).

72506155171 is an equidigital number, since it uses as much as digits as its factorization.

72506155171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73500, while the sum is 40.

The spelling of 72506155171 in words is "seventy-two billion, five hundred six million, one hundred fifty-five thousand, one hundred seventy-one".