8216561502 has 12 divisors (see below), whose sum is σ = 17802549960. Its totient is φ = 2738853828.

The previous prime is 8216561497. The next prime is 8216561527. The reversal of 8216561502 is 2051656128.

8216561502 is a `hidden beast` number, since 82 + 16 + 5 + 61 + 502 = 666.

It is a super-2 number, since 2×8216561502² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 228237802 + ... + 228237837.

It is an arithmetic number, because the mean of its divisors is an integer number (1483545830).

Almost surely, 2^8216561502 is an apocalyptic number.

8216561502 is an abundant number, since it is smaller than the sum of its proper divisors (9585988458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8216561502 is a wasteful number, since it uses less digits than its factorization.

8216561502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456475647 (or 456475644 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 8216561502 is about 90645.2508518786. The cubic root of 8216561502 is about 2017.8863541483.

The spelling of 8216561502 in words is "eight billion, two hundred sixteen million, five hundred sixty-one thousand, five hundred two".