15399201881 has 4 divisors (see below), whose sum is σ = 17599087872. Its totient is φ = 13199315892.

The previous prime is 15399201877. The next prime is 15399201907. The reversal of 15399201881 is 18810299351.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 15399201881 - 2² = 15399201877 is a prime.

It is a super-2 number, since 2×15399201881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15399201841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1099942985 + ... + 1099942998.

It is an arithmetic number, because the mean of its divisors is an integer number (4399771968).

Almost surely, 2^15399201881 is an apocalyptic number.

It is an amenable number.

15399201881 is a deficient number, since it is larger than the sum of its proper divisors (2199885991).

15399201881 is an equidigital number, since it uses as much as digits as its factorization.

15399201881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2199885990.

The product of its (nonzero) digits is 155520, while the sum is 47.

The spelling of 15399201881 in words is "fifteen billion, three hundred ninety-nine million, two hundred one thousand, eight hundred eighty-one".