79405040521 has 9 divisors (see below), whose sum is σ = 83809862733. Its totient is φ = 75220755660.

The previous prime is 79405040501. The next prime is 79405040531. The reversal of 79405040521 is 12504050497.

The square root of 79405040521 is 281789.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 79405040521 - 2⁹ = 79405040009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79405040501) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5346576 + ... + 5361406.

Almost surely, 2^79405040521 is an apocalyptic number.

79405040521 is the 281789-th square number.

79405040521 is the 140895-th centered octagonal number.

It is an amenable number.

79405040521 is a deficient number, since it is larger than the sum of its proper divisors (4404822212).

79405040521 is an frugal number, since it uses more digits than its factorization.

79405040521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29700 (or 14850 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 79405040521 in words is "seventy-nine billion, four hundred five million, forty thousand, five hundred twenty-one".