61551965826 has 32 divisors (see below), whose sum is σ = 147303851520. Its totient is φ = 18939066192.

The previous prime is 61551965789. The next prime is 61551965837. The reversal of 61551965826 is 62856915516.

61551965826 is a `hidden beast` number, since 6 + 1 + 5 + 51 + 9 + 6 + 582 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43839730 + ... + 43841133.

It is an arithmetic number, because the mean of its divisors is an integer number (4603245360).

Almost surely, 2^61551965826 is an apocalyptic number.

61551965826 is an abundant number, since it is smaller than the sum of its proper divisors (85751885694).

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

61551965826 is a wasteful number, since it uses less digits than its factorization.

61551965826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87680887 (or 87680881 counting only the distinct ones).

The product of its digits is 3888000, while the sum is 54.

The spelling of 61551965826 in words is "sixty-one billion, five hundred fifty-one million, nine hundred sixty-five thousand, eight hundred twenty-six".