22097987557 has 8 divisors (see below), whose sum is σ = 23421355416. Its totient is φ = 20777229312.

The previous prime is 22097987543. The next prime is 22097987573. The reversal of 22097987557 is 75578979022.

It can be written as a sum of positive squares in 4 ways, for example, as 8830172961 + 13267814596 = 93969^2 + 115186^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 22097987557 - 2²⁷ = 21963769829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22097987495 and 22097987504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22097987507) 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, 634948 + ... + 668845.

It is an arithmetic number, because the mean of its divisors is an integer number (2927669427).

Almost surely, 2^22097987557 is an apocalyptic number.

It is an amenable number.

22097987557 is a deficient number, since it is larger than the sum of its proper divisors (1323367859).

22097987557 is a wasteful number, since it uses less digits than its factorization.

22097987557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1304807.

The product of its (nonzero) digits is 22226400, while the sum is 61.

The spelling of 22097987557 in words is "twenty-two billion, ninety-seven million, nine hundred eighty-seven thousand, five hundred fifty-seven".