14921899561 has 2 divisors, whose sum is σ = 14921899562. Its totient is φ = 14921899560.

The previous prime is 14921899537. The next prime is 14921899567. The reversal of 14921899561 is 16599812941.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13643408025 + 1278491536 = 116805^2 + 35756^2 .

It is a cyclic number.

It is not a de Polignac number, because 14921899561 - 2²¹ = 14919802409 is a prime.

It is not a weakly prime, because it can be changed into another prime (14921899567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7460949780 + 7460949781.

It is an arithmetic number, because the mean of its divisors is an integer number (7460949781).

Almost surely, 2^14921899561 is an apocalyptic number.

It is an amenable number.

14921899561 is a deficient number, since it is larger than the sum of its proper divisors (1).

14921899561 is an equidigital number, since it uses as much as digits as its factorization.

14921899561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 55.

The spelling of 14921899561 in words is "fourteen billion, nine hundred twenty-one million, eight hundred ninety-nine thousand, five hundred sixty-one".