16315779780 has 120 divisors (see below), whose sum is σ = 51800297472. Its totient is φ = 4298419008.

The previous prime is 16315779743. The next prime is 16315779791. The reversal of 16315779780 is 8797751361.

16315779780 is a `hidden beast` number, since 1 + 63 + 1 + 577 + 9 + 7 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 73789 + ... + 195131.

Almost surely, 2^16315779780 is an apocalyptic number.

16315779780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16315779780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25900148736).

16315779780 is an abundant number, since it is smaller than the sum of its proper divisors (35484517692).

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

16315779780 is a wasteful number, since it uses less digits than its factorization.

16315779780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121447 (or 121436 counting only the distinct ones).

The product of its (nonzero) digits is 2222640, while the sum is 54.

The spelling of 16315779780 in words is "sixteen billion, three hundred fifteen million, seven hundred seventy-nine thousand, seven hundred eighty".