72561122777 has 32 divisors (see below), whose sum is σ = 85848559104. Its totient is φ = 60462028800.

The previous prime is 72561122731. The next prime is 72561122827. The reversal of 72561122777 is 77722116527.

It is a cyclic number.

It is not a de Polignac number, because 72561122777 - 2⁸ = 72561122521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72561122717) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12645053 + ... + 12650789.

It is an arithmetic number, because the mean of its divisors is an integer number (2682767472).

Almost surely, 2^72561122777 is an apocalyptic number.

It is an amenable number.

72561122777 is a deficient number, since it is larger than the sum of its proper divisors (13287436327).

72561122777 is a wasteful number, since it uses less digits than its factorization.

72561122777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6369.

The product of its digits is 576240, while the sum is 47.

The spelling of 72561122777 in words is "seventy-two billion, five hundred sixty-one million, one hundred twenty-two thousand, seven hundred seventy-seven".