377985656590021 has 2 divisors, whose sum is σ = 377985656590022. Its totient is φ = 377985656590020.

The previous prime is 377985656589707. The next prime is 377985656590057. The reversal of 377985656590021 is 120095656589773.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 238752406108225 + 139233250481796 = 15451615^2 + 11799714^2 .

It is a cyclic number.

It is not a de Polignac number, because 377985656590021 - 2¹⁵ = 377985656557253 is a prime.

It is a super-3 number, since 3×377985656590021³ (a number of 45 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (377985656590081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 188992828295010 + 188992828295011.

It is an arithmetic number, because the mean of its divisors is an integer number (188992828295011).

Almost surely, 2^{377985656590021} is an apocalyptic number.

It is an amenable number.

377985656590021 is a deficient number, since it is larger than the sum of its proper divisors (1).

377985656590021 is an equidigital number, since it uses as much as digits as its factorization.

377985656590021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 857304000, while the sum is 73.

The spelling of 377985656590021 in words is "three hundred seventy-seven trillion, nine hundred eighty-five billion, six hundred fifty-six million, five hundred ninety thousand, twenty-one".