15403940081 has 2 divisors, whose sum is σ = 15403940082. Its totient is φ = 15403940080.

The previous prime is 15403940047. The next prime is 15403940093. The reversal of 15403940081 is 18004930451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13215571681 + 2188368400 = 114959^2 + 46780^2 .

It is a cyclic number.

It is not a de Polignac number, because 15403940081 - 2³⁰ = 14330198257 is a prime.

It is a super-2 number, since 2×15403940081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15403943081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7701970040 + 7701970041.

It is an arithmetic number, because the mean of its divisors is an integer number (7701970041).

Almost surely, 2^15403940081 is an apocalyptic number.

It is an amenable number.

15403940081 is a deficient number, since it is larger than the sum of its proper divisors (1).

15403940081 is an equidigital number, since it uses as much as digits as its factorization.

15403940081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 35.

The spelling of 15403940081 in words is "fifteen billion, four hundred three million, nine hundred forty thousand, eighty-one".