85661506 has 32 divisors (see below), whose sum is σ = 150854400. Its totient is φ = 36465408.

The previous prime is 85661503. The next prime is 85661509. The reversal of 85661506 is 60516658.

It is an interprime number because it is at equal distance from previous prime (85661503) and next prime (85661509).

It is a super-2 number, since 2×85661506² = 14675787220376072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (85661501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132075 + ... + 132721.

It is an arithmetic number, because the mean of its divisors is an integer number (4714200).

Almost surely, 2^85661506 is an apocalyptic number.

85661506 is a deficient number, since it is larger than the sum of its proper divisors (65192894).

85661506 is a wasteful number, since it uses less digits than its factorization.

85661506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863 (or 849 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 85661506 is about 9255.3501284392. The cubic root of 85661506 is about 440.8206207560.

The spelling of 85661506 in words is "eighty-five million, six hundred sixty-one thousand, five hundred six".