1640615674747 has 4 divisors (see below), whose sum is σ = 1874989342576. Its totient is φ = 1406242006920.

The previous prime is 1640615674723. The next prime is 1640615674751. The reversal of 1640615674747 is 7474765160461.

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

It is a cyclic number.

It is not a de Polignac number, because 1640615674747 - 2²⁷ = 1640481457019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1640615674691 and 1640615674700.

It is not an unprimeable number, because it can be changed into a prime (1640615674717) 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, 117186833904 + ... + 117186833917.

It is an arithmetic number, because the mean of its divisors is an integer number (468747335644).

Almost surely, 2^{1640615674747} is an apocalyptic number.

1640615674747 is a deficient number, since it is larger than the sum of its proper divisors (234373667829).

1640615674747 is an equidigital number, since it uses as much as digits as its factorization.

1640615674747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234373667828.

The product of its (nonzero) digits is 23708160, while the sum is 58.

The spelling of 1640615674747 in words is "one trillion, six hundred forty billion, six hundred fifteen million, six hundred seventy-four thousand, seven hundred forty-seven".