15720772552506 has 128 divisors (see below), whose sum is σ = 42282198720000. Its totient is φ = 4226649403392.

The previous prime is 15720772552493. The next prime is 15720772552519. The reversal of 15720772552506 is 60525527702751.

15720772552506 is a `hidden beast` number, since 1 + 5 + 7 + 20 + 77 + 25 + 525 + 0 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (15720772552493) and next prime (15720772552519).

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 (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 34790790 + ... + 35239758.

It is an arithmetic number, because the mean of its divisors is an integer number (330329677500).

Almost surely, 2^{15720772552506} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15720772552506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21141099360000).

15720772552506 is an abundant number, since it is smaller than the sum of its proper divisors (26561426167494).

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

15720772552506 is a wasteful number, since it uses less digits than its factorization.

15720772552506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454453 (or 454447 counting only the distinct ones).

The product of its (nonzero) digits is 10290000, while the sum is 54.

The spelling of 15720772552506 in words is "fifteen trillion, seven hundred twenty billion, seven hundred seventy-two million, five hundred fifty-two thousand, five hundred six".