6645397774 has 16 divisors (see below), whose sum is σ = 10622803968. Its totient is φ = 3110610712.

The previous prime is 6645397769. The next prime is 6645397819. The reversal of 6645397774 is 4777935466.

It is a super-2 number, since 2×6645397774² = 88322623149368310152, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1534702 + ... + 1539025.

It is an arithmetic number, because the mean of its divisors is an integer number (663925248).

Almost surely, 2^6645397774 is an apocalyptic number.

6645397774 is a deficient number, since it is larger than the sum of its proper divisors (3977406194).

6645397774 is a wasteful number, since it uses less digits than its factorization.

6645397774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3073799.

The product of its digits is 26671680, while the sum is 58.

The square root of 6645397774 is about 81519.3092095364. The cubic root of 6645397774 is about 1880.0684460896.

The spelling of 6645397774 in words is "six billion, six hundred forty-five million, three hundred ninety-seven thousand, seven hundred seventy-four".