5121720057501 has 10 divisors (see below), whose sum is σ = 7650964530462. Its totient is φ = 3414480038280.

The previous prime is 5121720057401. The next prime is 5121720057539. The reversal of 5121720057501 is 1057500271215.

5121720057501 is a `hidden beast` number, since 5 + 12 + 1 + 72 + 0 + 0 + 575 + 0 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4925536616025 + 196183441476 = 2219355^2 + 442926^2 .

It is not a de Polignac number, because 5121720057501 - 2¹³ = 5121720049309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5121720057541) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 31615555830 + ... + 31615555991.

Almost surely, 2^{5121720057501} is an apocalyptic number.

It is an amenable number.

5121720057501 is a deficient number, since it is larger than the sum of its proper divisors (2529244472961).

5121720057501 is an equidigital number, since it uses as much as digits as its factorization.

5121720057501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63231111833 (or 63231111824 counting only the distinct ones).

The product of its (nonzero) digits is 24500, while the sum is 36.

The spelling of 5121720057501 in words is "five trillion, one hundred twenty-one billion, seven hundred twenty million, fifty-seven thousand, five hundred one".