1640376654677 has 4 divisors (see below), whose sum is σ = 1644079536960. Its totient is φ = 1636673772396.

The previous prime is 1640376654661. The next prime is 1640376654739. The reversal of 1640376654677 is 7764566730461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1640376654677 - 2⁴ = 1640376654661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640376644677) 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, 1851440477 + ... + 1851441362.

It is an arithmetic number, because the mean of its divisors is an integer number (411019884240).

Almost surely, 2^{1640376654677} is an apocalyptic number.

It is an amenable number.

1640376654677 is a deficient number, since it is larger than the sum of its proper divisors (3702882283).

1640376654677 is an equidigital number, since it uses as much as digits as its factorization.

1640376654677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3702882282.

The product of its (nonzero) digits is 106686720, while the sum is 62.

The spelling of 1640376654677 in words is "one trillion, six hundred forty billion, three hundred seventy-six million, six hundred fifty-four thousand, six hundred seventy-seven".