377668721 has 4 divisors (see below), whose sum is σ = 378184692. Its totient is φ = 377152752.

The previous prime is 377668673. The next prime is 377668747. The reversal of 377668721 is 127866773.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127866773 = 6199 ⋅20627.

It can be written as a sum of positive squares in 2 ways, for example, as 214212496 + 163456225 = 14636^2 + 12785^2 .

It is a cyclic number.

It is not a de Polignac number, because 377668721 - 2¹⁸ = 377406577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (377668771) 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, 256886 + ... + 258351.

It is an arithmetic number, because the mean of its divisors is an integer number (94546173).

Almost surely, 2^377668721 is an apocalyptic number.

It is an amenable number.

377668721 is a deficient number, since it is larger than the sum of its proper divisors (515971).

377668721 is an equidigital number, since it uses as much as digits as its factorization.

377668721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515970.

The product of its digits is 592704, while the sum is 47.

The square root of 377668721 is about 19433.7006511884. The cubic root of 377668721 is about 722.8313927762.

The spelling of 377668721 in words is "three hundred seventy-seven million, six hundred sixty-eight thousand, seven hundred twenty-one".