72801861705 has 24 divisors (see below), whose sum is σ = 131676412608. Its totient is φ = 37139499936.

The previous prime is 72801861697. The next prime is 72801861757. The reversal of 72801861705 is 50716810827.

It is a happy number.

72801861705 is a `hidden beast` number, since 7 + 28 + 0 + 1 + 8 + 617 + 0 + 5 = 666.

It is not a de Polignac number, because 72801861705 - 2³ = 72801861697 is a prime.

It is a super-2 number, since 2×72801861705² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35168947 + ... + 35171016.

It is an arithmetic number, because the mean of its divisors is an integer number (5486517192).

Almost surely, 2^72801861705 is an apocalyptic number.

It is an amenable number.

72801861705 is a deficient number, since it is larger than the sum of its proper divisors (58874550903).

72801861705 is a wasteful number, since it uses less digits than its factorization.

72801861705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70339997 (or 70339994 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 45.

The spelling of 72801861705 in words is "seventy-two billion, eight hundred one million, eight hundred sixty-one thousand, seven hundred five".