838701661 has 4 divisors (see below), whose sum is σ = 958516192. Its totient is φ = 718887132.

The previous prime is 838701649. The next prime is 838701671. The reversal of 838701661 is 166107838.

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 838701661 - 2²⁵ = 805147229 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 (838701641) 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, 59907255 + ... + 59907268.

It is an arithmetic number, because the mean of its divisors is an integer number (239629048).

Almost surely, 2^838701661 is an apocalyptic number.

It is an amenable number.

838701661 is a deficient number, since it is larger than the sum of its proper divisors (119814531).

838701661 is a wasteful number, since it uses less digits than its factorization.

838701661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119814530.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 838701661 is about 28960.3463549730. The cubic root of 838701661 is about 943.0524210976.

The spelling of 838701661 in words is "eight hundred thirty-eight million, seven hundred one thousand, six hundred sixty-one".