78133736550 has 72 divisors (see below), whose sum is σ = 205840604376. Its totient is φ = 19610024960.

The previous prime is 78133736519. The next prime is 78133736579. The reversal of 78133736550 is 5563733187.

It is a super-2 number, since 2×78133736550² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78133736550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 857847 + ... + 944546.

It is an arithmetic number, because the mean of its divisors is an integer number (2858897283).

Almost surely, 2^78133736550 is an apocalyptic number.

78133736550 is an abundant number, since it is smaller than the sum of its proper divisors (127706867826).

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

78133736550 is a wasteful number, since it uses less digits than its factorization.

78133736550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1802442 (or 1802420 counting only the distinct ones).

The product of its (nonzero) digits is 1587600, while the sum is 48.

The spelling of 78133736550 in words is "seventy-eight billion, one hundred thirty-three million, seven hundred thirty-six thousand, five hundred fifty".