15506792478 has 48 divisors (see below), whose sum is σ = 34912725120. Its totient is φ = 4968274752.

The previous prime is 15506792453. The next prime is 15506792513. The reversal of 15506792478 is 87429760551.

15506792478 is a `hidden beast` number, since 1 + 5 + 506 + 7 + 92 + 47 + 8 = 666.

It is a super-2 number, since 2×15506792478² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49800 + ... + 183012.

It is an arithmetic number, because the mean of its divisors is an integer number (727348440).

Almost surely, 2^15506792478 is an apocalyptic number.

15506792478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 15506792478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17456362560).

15506792478 is an abundant number, since it is smaller than the sum of its proper divisors (19405932642).

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

15506792478 is a wasteful number, since it uses less digits than its factorization.

15506792478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133473 (or 133470 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 54.

The spelling of 15506792478 in words is "fifteen billion, five hundred six million, seven hundred ninety-two thousand, four hundred seventy-eight".