72151435858 has 4 divisors (see below), whose sum is σ = 108227153790. Its totient is φ = 36075717928.

The previous prime is 72151435849. The next prime is 72151435877. The reversal of 72151435858 is 85853415127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85853415127 = 37 ⋅2320362571.

It can be written as a sum of positive squares in only one way, i.e., 40821373849 + 31330062009 = 202043^2 + 177003^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18037858963 + ... + 18037858966.

Almost surely, 2^72151435858 is an apocalyptic number.

72151435858 is a deficient number, since it is larger than the sum of its proper divisors (36075717932).

72151435858 is a wasteful number, since it uses less digits than its factorization.

72151435858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36075717931.

The product of its digits is 1344000, while the sum is 49.

The spelling of 72151435858 in words is "seventy-two billion, one hundred fifty-one million, four hundred thirty-five thousand, eight hundred fifty-eight".