72099124561 has 16 divisors (see below), whose sum is σ = 76519618560. Its totient is φ = 67816062720.

The previous prime is 72099124543. The next prime is 72099124567. The reversal of 72099124561 is 16542199027.

It is a cyclic number.

It is not a de Polignac number, because 72099124561 - 2⁵ = 72099124529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72099124567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 402121 + ... + 553081.

It is an arithmetic number, because the mean of its divisors is an integer number (4782476160).

Almost surely, 2^72099124561 is an apocalyptic number.

It is an amenable number.

72099124561 is a deficient number, since it is larger than the sum of its proper divisors (4420493999).

72099124561 is a wasteful number, since it uses less digits than its factorization.

72099124561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151416.

The product of its (nonzero) digits is 272160, while the sum is 46.

The spelling of 72099124561 in words is "seventy-two billion, ninety-nine million, one hundred twenty-four thousand, five hundred sixty-one".