577461872180021 has 2 divisors, whose sum is σ = 577461872180022. Its totient is φ = 577461872180020.

The previous prime is 577461872179981. The next prime is 577461872180029. The reversal of 577461872180021 is 120081278164775.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 439400664676996 + 138061207503025 = 20961886^2 + 11749945^2 .

It is a cyclic number.

It is not a de Polignac number, because 577461872180021 - 2¹⁸ = 577461871917877 is a prime.

It is a super-2 number, since 2×577461872180021² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (577461872180029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 288730936090010 + 288730936090011.

It is an arithmetic number, because the mean of its divisors is an integer number (288730936090011).

Almost surely, 2^{577461872180021} is an apocalyptic number.

It is an amenable number.

577461872180021 is a deficient number, since it is larger than the sum of its proper divisors (1).

577461872180021 is an equidigital number, since it uses as much as digits as its factorization.

577461872180021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10536960, while the sum is 59.

The spelling of 577461872180021 in words is "five hundred seventy-seven trillion, four hundred sixty-one billion, eight hundred seventy-two million, one hundred eighty thousand, twenty-one".