15138121773 has 4 divisors (see below), whose sum is σ = 20184162368. Its totient is φ = 10092081180.

The previous prime is 15138121753. The next prime is 15138121777. The reversal of 15138121773 is 37712183151.

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 15138121773 - 2⁶ = 15138121709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15138121777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2523020293 + ... + 2523020298.

It is an arithmetic number, because the mean of its divisors is an integer number (5046040592).

Almost surely, 2^15138121773 is an apocalyptic number.

It is an amenable number.

15138121773 is a deficient number, since it is larger than the sum of its proper divisors (5046040595).

15138121773 is an equidigital number, since it uses as much as digits as its factorization.

15138121773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5046040594.

The product of its digits is 35280, while the sum is 39.

The spelling of 15138121773 in words is "fifteen billion, one hundred thirty-eight million, one hundred twenty-one thousand, seven hundred seventy-three".