849623661 has 10 divisors (see below), whose sum is σ = 1269191022. Its totient is φ = 566415720.

The previous prime is 849623647. The next prime is 849623707. The reversal of 849623661 is 166326948.

849623661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 832034025 + 17589636 = 28845^2 + 4194^2 .

It is not a de Polignac number, because 849623661 - 2⁶ = 849623597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (849623641) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5244510 + ... + 5244671.

Almost surely, 2^849623661 is an apocalyptic number.

849623661 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

849623661 is a deficient number, since it is larger than the sum of its proper divisors (419567361).

849623661 is a wasteful number, since it uses less digits than its factorization.

849623661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10489193 (or 10489184 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 849623661 is about 29148.3045990672. The cubic root of 849623661 is about 947.1284149871.

The spelling of 849623661 in words is "eight hundred forty-nine million, six hundred twenty-three thousand, six hundred sixty-one".