15801677661 has 16 divisors (see below), whose sum is σ = 26267724288. Its totient is φ = 8208663600.

The previous prime is 15801677657. The next prime is 15801677663. The reversal of 15801677661 is 16677610851.

It is not a de Polignac number, because 15801677661 - 2² = 15801677657 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 15801677661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15801677663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34202535 + ... + 34202996.

It is an arithmetic number, because the mean of its divisors is an integer number (1641732768).

Almost surely, 2^15801677661 is an apocalyptic number.

15801677661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15801677661 is a deficient number, since it is larger than the sum of its proper divisors (10466046627).

15801677661 is a wasteful number, since it uses less digits than its factorization.

15801677661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68405552.

The product of its (nonzero) digits is 423360, while the sum is 48.

The spelling of 15801677661 in words is "fifteen billion, eight hundred one million, six hundred seventy-seven thousand, six hundred sixty-one".