297897821538 has 16 divisors (see below), whose sum is σ = 611898228480. Its totient is φ = 96615509616.

The previous prime is 297897821537. The next prime is 297897821563. The reversal of 297897821538 is 835128798792.

It is a super-2 number, since 2×297897821538² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (297897821537) 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, 670940818 + ... + 670941261.

It is an arithmetic number, because the mean of its divisors is an integer number (38243639280).

Almost surely, 2^297897821538 is an apocalyptic number.

297897821538 is an abundant number, since it is smaller than the sum of its proper divisors (314000406942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

297897821538 is a wasteful number, since it uses less digits than its factorization.

297897821538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1341882121.

The product of its digits is 121927680, while the sum is 69.

The spelling of 297897821538 in words is "two hundred ninety-seven billion, eight hundred ninety-seven million, eight hundred twenty-one thousand, five hundred thirty-eight".