16277538778 has 8 divisors (see below), whose sum is σ = 24816575700. Its totient is φ = 8005346880.

The previous prime is 16277538737. The next prime is 16277538803. The reversal of 16277538778 is 87783577261.

It can be written as a sum of positive squares in 2 ways, for example, as 16221333769 + 56205009 = 127363^2 + 7497^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66711103 + ... + 66711346.

Almost surely, 2^16277538778 is an apocalyptic number.

16277538778 is a deficient number, since it is larger than the sum of its proper divisors (8539036922).

16277538778 is a wasteful number, since it uses less digits than its factorization.

16277538778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133422512.

The product of its digits is 27659520, while the sum is 61.

The spelling of 16277538778 in words is "sixteen billion, two hundred seventy-seven million, five hundred thirty-eight thousand, seven hundred seventy-eight".