645196777742 has 24 divisors (see below), whose sum is σ = 1090932511896. Its totient is φ = 283810890000.

The previous prime is 645196777741. The next prime is 645196777763. The reversal of 645196777742 is 247777691546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645196777741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15237509 + ... + 15279792.

It is an arithmetic number, because the mean of its divisors is an integer number (45455521329).

Almost surely, 2^645196777742 is an apocalyptic number.

645196777742 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

645196777742 is a deficient number, since it is larger than the sum of its proper divisors (445735734154).

645196777742 is a wasteful number, since it uses less digits than its factorization.

645196777742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30517376 (or 30517345 counting only the distinct ones).

The product of its digits is 124467840, while the sum is 65.

The spelling of 645196777742 in words is "six hundred forty-five billion, one hundred ninety-six million, seven hundred seventy-seven thousand, seven hundred forty-two".