18250977505 has 8 divisors (see below), whose sum is σ = 21902955624. Its totient is φ = 14599593600.

The previous prime is 18250977499. The next prime is 18250977557. The reversal of 18250977505 is 50577905281.

It can be written as a sum of positive squares in 4 ways, for example, as 1141291089 + 17109686416 = 33783^2 + 130804^2 .

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

It is not a de Polignac number, because 18250977505 - 2⁵ = 18250977473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77926 + ... + 206335.

It is an arithmetic number, because the mean of its divisors is an integer number (2737869453).

Almost surely, 2^18250977505 is an apocalyptic number.

It is an amenable number.

18250977505 is a deficient number, since it is larger than the sum of its proper divisors (3651978119).

18250977505 is a wasteful number, since it uses less digits than its factorization.

18250977505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297107.

The product of its (nonzero) digits is 882000, while the sum is 49.

The spelling of 18250977505 in words is "eighteen billion, two hundred fifty million, nine hundred seventy-seven thousand, five hundred five".