15994277641 has 8 divisors (see below), whose sum is σ = 16048020680. Its totient is φ = 15940603008.

The previous prime is 15994277627. The next prime is 15994277659. The reversal of 15994277641 is 14677249951.

It can be written as a sum of positive squares in 4 ways, for example, as 10339839225 + 5654438416 = 101685^2 + 75196^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15994277641 - 2¹³ = 15994269449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15994277681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 474805 + ... + 507373.

It is an arithmetic number, because the mean of its divisors is an integer number (2006002585).

Almost surely, 2^15994277641 is an apocalyptic number.

It is an amenable number.

15994277641 is a deficient number, since it is larger than the sum of its proper divisors (53743039).

15994277641 is a wasteful number, since it uses less digits than its factorization.

15994277641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34203.

The product of its digits is 3810240, while the sum is 55.

The spelling of 15994277641 in words is "fifteen billion, nine hundred ninety-four million, two hundred seventy-seven thousand, six hundred forty-one".