800078661 has 32 divisors (see below), whose sum is σ = 1197504000. Its totient is φ = 527929920.

The previous prime is 800078641. The next prime is 800078681. The reversal of 800078661 is 166870008.

It is an interprime number because it is at equal distance from previous prime (800078641) and next prime (800078681).

It is not a de Polignac number, because 800078661 - 2¹⁸ = 799816517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (800078611) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1856116 + ... + 1856546.

It is an arithmetic number, because the mean of its divisors is an integer number (37422000).

Almost surely, 2^800078661 is an apocalyptic number.

It is an amenable number.

800078661 is a deficient number, since it is larger than the sum of its proper divisors (397425339).

800078661 is a wasteful number, since it uses less digits than its factorization.

800078661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986 (or 980 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 800078661 is about 28285.6617564447. The cubic root of 800078661 is about 928.3481917270.

The spelling of 800078661 in words is "eight hundred million, seventy-eight thousand, six hundred sixty-one".