15771791880 has 640 divisors, whose sum is σ = 60418068480. Its totient is φ = 3662807040.

The previous prime is 15771791873. The next prime is 15771791899. The reversal of 15771791880 is 8819717751.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 61368712 + ... + 61368968.

It is an arithmetic number, because the mean of its divisors is an integer number (94403232).

Almost surely, 2^15771791880 is an apocalyptic number.

15771791880 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 15771791880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30209034240).

15771791880 is an abundant number, since it is smaller than the sum of its proper divisors (44646276600).

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

15771791880 is a wasteful number, since it uses less digits than its factorization.

15771791880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371 (or 358 counting only the distinct ones).

The product of its (nonzero) digits is 987840, while the sum is 54.

The spelling of 15771791880 in words is "fifteen billion, seven hundred seventy-one million, seven hundred ninety-one thousand, eight hundred eighty".