15345020681 has 2 divisors, whose sum is σ = 15345020682. Its totient is φ = 15345020680.

The previous prime is 15345020629. The next prime is 15345020773. The reversal of 15345020681 is 18602054351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11393641081 + 3951379600 = 106741^2 + 62860^2 .

It is a cyclic number.

It is not a de Polignac number, because 15345020681 - 2¹⁸ = 15344758537 is a prime.

It is a super-2 number, since 2×15345020681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15345020081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7672510340 + 7672510341.

It is an arithmetic number, because the mean of its divisors is an integer number (7672510341).

Almost surely, 2^15345020681 is an apocalyptic number.

It is an amenable number.

15345020681 is a deficient number, since it is larger than the sum of its proper divisors (1).

15345020681 is an equidigital number, since it uses as much as digits as its factorization.

15345020681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 15345020681 in words is "fifteen billion, three hundred forty-five million, twenty thousand, six hundred eighty-one".