15201661481 has 2 divisors, whose sum is σ = 15201661482. Its totient is φ = 15201661480.

The previous prime is 15201661463. The next prime is 15201661523. The reversal of 15201661481 is 18416610251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15192781081 + 8880400 = 123259^2 + 2980^2 .

It is a cyclic number.

It is not a de Polignac number, because 15201661481 - 2²² = 15197467177 is a prime.

It is a super-2 number, since 2×15201661481² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15201661421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7600830740 + 7600830741.

It is an arithmetic number, because the mean of its divisors is an integer number (7600830741).

Almost surely, 2^15201661481 is an apocalyptic number.

It is an amenable number.

15201661481 is a deficient number, since it is larger than the sum of its proper divisors (1).

15201661481 is an equidigital number, since it uses as much as digits as its factorization.

15201661481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 35.

The spelling of 15201661481 in words is "fifteen billion, two hundred one million, six hundred sixty-one thousand, four hundred eighty-one".