838377661 has 12 divisors (see below), whose sum is σ = 975732156. Its totient is φ = 717326720.

The previous prime is 838377649. The next prime is 838377677. The reversal of 838377661 is 166773838.

It can be written as a sum of positive squares in 2 ways, for example, as 773896761 + 64480900 = 27819^2 + 8030^2 .

It is not a de Polignac number, because 838377661 - 2²¹ = 836280509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (838777661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 201730 + ... + 205843.

It is an arithmetic number, because the mean of its divisors is an integer number (81311013).

Almost surely, 2^838377661 is an apocalyptic number.

It is an amenable number.

838377661 is a deficient number, since it is larger than the sum of its proper divisors (137354495).

838377661 is a wasteful number, since it uses less digits than its factorization.

838377661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407612 (or 407601 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 49.

The square root of 838377661 is about 28954.7519588754. The cubic root of 838377661 is about 942.9309681612.

The spelling of 838377661 in words is "eight hundred thirty-eight million, three hundred seventy-seven thousand, six hundred sixty-one".