1640970792961 has 4 divisors (see below), whose sum is σ = 1641575650372. Its totient is φ = 1640365935552.

The previous prime is 1640970792911. The next prime is 1640970792973. The reversal of 1640970792961 is 1692970790461.

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

It can be written as a sum of positive squares in 2 ways, for example, as 778552110736 + 862418682225 = 882356^2 + 928665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640970792961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1640970792961.

It is not an unprimeable number, because it can be changed into a prime (1640970792911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302424636 + ... + 302430061.

It is an arithmetic number, because the mean of its divisors is an integer number (410393912593).

Almost surely, 2^{1640970792961} is an apocalyptic number.

It is an amenable number.

1640970792961 is a deficient number, since it is larger than the sum of its proper divisors (604857411).

1640970792961 is an equidigital number, since it uses as much as digits as its factorization.

1640970792961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604857410.

The product of its (nonzero) digits is 10287648, while the sum is 61.

The spelling of 1640970792961 in words is "one trillion, six hundred forty billion, nine hundred seventy million, seven hundred ninety-two thousand, nine hundred sixty-one".