15777780479 has 12 divisors (see below), whose sum is σ = 16382145312. Its totient is φ = 15188765760.

The previous prime is 15777780451. The next prime is 15777780493. The reversal of 15777780479 is 97408777751.

It is not a de Polignac number, because 15777780479 - 2¹² = 15777776383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15777780449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129779 + ... + 219995.

It is an arithmetic number, because the mean of its divisors is an integer number (1365178776).

Almost surely, 2^15777780479 is an apocalyptic number.

15777780479 is a deficient number, since it is larger than the sum of its proper divisors (604364833).

15777780479 is an frugal number, since it uses more digits than its factorization.

15777780479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90386 (or 90325 counting only the distinct ones).

The product of its (nonzero) digits is 24202080, while the sum is 62.

The spelling of 15777780479 in words is "fifteen billion, seven hundred seventy-seven million, seven hundred eighty thousand, four hundred seventy-nine".