2640404416642 has 4 divisors (see below), whose sum is σ = 3960606624966. Its totient is φ = 1320202208320.

The previous prime is 2640404416627. The next prime is 2640404416717. The reversal of 2640404416642 is 2466144040462.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1618240954201 + 1022163462441 = 1272101^2 + 1011021^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660101104159 + ... + 660101104162.

Almost surely, 2^{2640404416642} is an apocalyptic number.

2640404416642 is a deficient number, since it is larger than the sum of its proper divisors (1320202208324).

2640404416642 is a wasteful number, since it uses less digits than its factorization.

2640404416642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320202208323.

The product of its (nonzero) digits is 884736, while the sum is 43.

The spelling of 2640404416642 in words is "two trillion, six hundred forty billion, four hundred four million, four hundred sixteen thousand, six hundred forty-two".