11897481657 has 4 divisors (see below), whose sum is σ = 15863308880. Its totient is φ = 7931654436.

The previous prime is 11897481643. The next prime is 11897481667. The reversal of 11897481657 is 75618479811.

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 11897481657 - 2¹² = 11897477561 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11897481597 and 11897481606.

It is not an unprimeable number, because it can be changed into a prime (11897481667) 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, 1982913607 + ... + 1982913612.

It is an arithmetic number, because the mean of its divisors is an integer number (3965827220).

Almost surely, 2^11897481657 is an apocalyptic number.

It is an amenable number.

11897481657 is a deficient number, since it is larger than the sum of its proper divisors (3965827223).

11897481657 is an equidigital number, since it uses as much as digits as its factorization.

11897481657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3965827222.

The product of its digits is 3386880, while the sum is 57.

The spelling of 11897481657 in words is "eleven billion, eight hundred ninety-seven million, four hundred eighty-one thousand, six hundred fifty-seven".