2691971993618 has 16 divisors (see below), whose sum is σ = 4088672494200. Its totient is φ = 1329142972416.

The previous prime is 2691971993587. The next prime is 2691971993651. The reversal of 2691971993618 is 8163991791962.

It can be written as a sum of positive squares in 4 ways, for example, as 2518876887409 + 173095106209 = 1587097^2 + 416047^2 .

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, 15365171 + ... + 15539382.

Almost surely, 2^{2691971993618} is an apocalyptic number.

2691971993618 is a deficient number, since it is larger than the sum of its proper divisors (1396700500582).

2691971993618 is a wasteful number, since it uses less digits than its factorization.

2691971993618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30905101.

The product of its digits is 79361856, while the sum is 71.

The spelling of 2691971993618 in words is "two trillion, six hundred ninety-one billion, nine hundred seventy-one million, nine hundred ninety-three thousand, six hundred eighteen".