72520220537 has 4 divisors (see below), whose sum is σ = 72521802576. Its totient is φ = 72518638500.

The previous prime is 72520220527. The next prime is 72520220573. The reversal of 72520220537 is 73502202527.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72520220537 - 2⁶ = 72520220473 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72520220497 and 72520220506.

It is not an unprimeable number, because it can be changed into a prime (72520220527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 720143 + ... + 814644.

It is an arithmetic number, because the mean of its divisors is an integer number (18130450644).

Almost surely, 2^72520220537 is an apocalyptic number.

It is an amenable number.

72520220537 is a deficient number, since it is larger than the sum of its proper divisors (1582039).

72520220537 is a wasteful number, since it uses less digits than its factorization.

72520220537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1582038.

The product of its (nonzero) digits is 58800, while the sum is 35.

The spelling of 72520220537 in words is "seventy-two billion, five hundred twenty million, two hundred twenty thousand, five hundred thirty-seven".