501054550405561 has 4 divisors (see below), whose sum is σ = 501328201172224. Its totient is φ = 500780899638900.

The previous prime is 501054550405523. The next prime is 501054550405567. The reversal of 501054550405561 is 165504055450105.

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 501054550405561 - 2²⁹ = 501054013534649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (501054550405567) 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, 136825380585 + ... + 136825384246.

It is an arithmetic number, because the mean of its divisors is an integer number (125332050293056).

Almost surely, 2^{501054550405561} is an apocalyptic number.

It is an amenable number.

501054550405561 is a deficient number, since it is larger than the sum of its proper divisors (273650766663).

501054550405561 is a wasteful number, since it uses less digits than its factorization.

501054550405561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273650766662.

The product of its (nonzero) digits is 1500000, while the sum is 46.

The spelling of 501054550405561 in words is "five hundred one trillion, fifty-four billion, five hundred fifty million, four hundred five thousand, five hundred sixty-one".