15781641734157 has 32 divisors (see below), whose sum is σ = 23215303762560. Its totient is φ = 9474179527680.

The previous prime is 15781641734041. The next prime is 15781641734351. The reversal of 15781641734157 is 75143714618751.

It is not a de Polignac number, because 15781641734157 - 2⁷ = 15781641734029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15781641734157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15781641734357) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20828953 + ... + 21573329.

It is an arithmetic number, because the mean of its divisors is an integer number (725478242580).

Almost surely, 2^{15781641734157} is an apocalyptic number.

It is an amenable number.

15781641734157 is a deficient number, since it is larger than the sum of its proper divisors (7433662028403).

15781641734157 is a wasteful number, since it uses less digits than its factorization.

15781641734157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757693.

The product of its digits is 19756800, while the sum is 60.

The spelling of 15781641734157 in words is "fifteen trillion, seven hundred eighty-one billion, six hundred forty-one million, seven hundred thirty-four thousand, one hundred fifty-seven".