18150857477 has 8 divisors (see below), whose sum is σ = 18496151064. Its totient is φ = 17805668608.

The previous prime is 18150857471. The next prime is 18150857503. The reversal of 18150857477 is 77475805181.

It can be written as a sum of positive squares in 4 ways, for example, as 9178789636 + 8972067841 = 95806^2 + 94721^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18150857477 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18150857471) 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, 384353 + ... + 428985.

It is an arithmetic number, because the mean of its divisors is an integer number (2312018883).

Almost surely, 2^18150857477 is an apocalyptic number.

It is an amenable number.

18150857477 is a deficient number, since it is larger than the sum of its proper divisors (345293587).

18150857477 is an equidigital number, since it uses as much as digits as its factorization.

18150857477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52359.

The product of its (nonzero) digits is 2195200, while the sum is 53.

The spelling of 18150857477 in words is "eighteen billion, one hundred fifty million, eight hundred fifty-seven thousand, four hundred seventy-seven".