2197644697755 has 64 divisors (see below), whose sum is σ = 4454954017920. Its totient is φ = 1018275176448.

The previous prime is 2197644697739. The next prime is 2197644697769. The reversal of 2197644697755 is 5577964467912.

2197644697755 is a `hidden beast` number, since 2 + 1 + 97 + 6 + 4 + 469 + 7 + 75 + 5 = 666.

It is not a de Polignac number, because 2197644697755 - 2⁴ = 2197644697739 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 36800142 + ... + 36859811.

It is an arithmetic number, because the mean of its divisors is an integer number (69608656530).

Almost surely, 2^{2197644697755} is an apocalyptic number.

2197644697755 is an abundant number, since it is smaller than the sum of its proper divisors (2257309320165).

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

2197644697755 is a wasteful number, since it uses less digits than its factorization.

2197644697755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73659997 (or 73659991 counting only the distinct ones).

The product of its digits is 800150400, while the sum is 72.

The spelling of 2197644697755 in words is "two trillion, one hundred ninety-seven billion, six hundred forty-four million, six hundred ninety-seven thousand, seven hundred fifty-five".