64361551878 has 48 divisors (see below), whose sum is σ = 150761441376. Its totient is φ = 19726479360.

The previous prime is 64361551861. The next prime is 64361551907. The reversal of 64361551878 is 87815516346.

It is a happy number.

64361551878 is a `hidden beast` number, since 6 + 4 + 3 + 6 + 1 + 551 + 87 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 474978 + ... + 595253.

It is an arithmetic number, because the mean of its divisors is an integer number (3140863362).

Almost surely, 2^64361551878 is an apocalyptic number.

64361551878 is an abundant number, since it is smaller than the sum of its proper divisors (86399889498).

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

64361551878 is a wasteful number, since it uses less digits than its factorization.

64361551878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070509 (or 1070506 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 54.

The spelling of 64361551878 in words is "sixty-four billion, three hundred sixty-one million, five hundred fifty-one thousand, eight hundred seventy-eight".