77800199554 has 16 divisors (see below), whose sum is σ = 145496477376. Its totient is φ = 30311766000.

The previous prime is 77800199539. The next prime is 77800199573. The reversal of 77800199554 is 45599100877.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 77800199495 and 77800199504.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252597897 + ... + 252598204.

It is an arithmetic number, because the mean of its divisors is an integer number (9093529836).

Almost surely, 2^77800199554 is an apocalyptic number.

77800199554 is a deficient number, since it is larger than the sum of its proper divisors (67696277822).

77800199554 is a wasteful number, since it uses less digits than its factorization.

77800199554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505196121.

The product of its (nonzero) digits is 3175200, while the sum is 55.

The spelling of 77800199554 in words is "seventy-seven billion, eight hundred million, one hundred ninety-nine thousand, five hundred fifty-four".