15786140981 has 16 divisors (see below), whose sum is σ = 17596320000. Its totient is φ = 14061636288.

The previous prime is 15786140939. The next prime is 15786140999. The reversal of 15786140981 is 18904168751.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 15786140981 - 2¹⁸ = 15785878837 is a prime.

It is a super-2 number, since 2×15786140981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15786140921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 743150 + ... + 764096.

It is an arithmetic number, because the mean of its divisors is an integer number (1099770000).

Almost surely, 2^15786140981 is an apocalyptic number.

It is an amenable number.

15786140981 is a deficient number, since it is larger than the sum of its proper divisors (1810179019).

15786140981 is a wasteful number, since it uses less digits than its factorization.

15786140981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22988.

The product of its (nonzero) digits is 483840, while the sum is 50.

The spelling of 15786140981 in words is "fifteen billion, seven hundred eighty-six million, one hundred forty thousand, nine hundred eighty-one".