61861500216 has 24 divisors (see below), whose sum is σ = 167541563280. Its totient is φ = 20620500048.

The previous prime is 61861500187. The next prime is 61861500221. The reversal of 61861500216 is 61200516816.

61861500216 is a `hidden beast` number, since 6 + 18 + 615 + 0 + 0 + 21 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 429593680 + ... + 429593823.

It is an arithmetic number, because the mean of its divisors is an integer number (6980898470).

Almost surely, 2^61861500216 is an apocalyptic number.

It is an amenable number.

61861500216 is an abundant number, since it is smaller than the sum of its proper divisors (105680063064).

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

61861500216 is a wasteful number, since it uses less digits than its factorization.

61861500216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859187515 (or 859187508 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The spelling of 61861500216 in words is "sixty-one billion, eight hundred sixty-one million, five hundred thousand, two hundred sixteen".