15664485623 has 2 divisors, whose sum is σ = 15664485624. Its totient is φ = 15664485622.

The previous prime is 15664485619. The next prime is 15664485653. The reversal of 15664485623 is 32658446651.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15664485623 - 2² = 15664485619 is a prime.

It is a super-2 number, since 2×15664485623² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15664485653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7832242811 + 7832242812.

It is an arithmetic number, because the mean of its divisors is an integer number (7832242812).

Almost surely, 2^15664485623 is an apocalyptic number.

15664485623 is a deficient number, since it is larger than the sum of its proper divisors (1).

15664485623 is an equidigital number, since it uses as much as digits as its factorization.

15664485623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4147200, while the sum is 50.

The spelling of 15664485623 in words is "fifteen billion, six hundred sixty-four million, four hundred eighty-five thousand, six hundred twenty-three".