645776732542 has 8 divisors (see below), whose sum is σ = 969278571000. Its totient is φ = 322683875544.

The previous prime is 645776732519. The next prime is 645776732551. The reversal of 645776732542 is 245237677546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102241417 + ... + 102247732.

It is an arithmetic number, because the mean of its divisors is an integer number (121159821375).

Almost surely, 2^645776732542 is an apocalyptic number.

645776732542 is a deficient number, since it is larger than the sum of its proper divisors (323501838458).

645776732542 is a wasteful number, since it uses less digits than its factorization.

645776732542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204490730.

The product of its digits is 59270400, while the sum is 58.

The spelling of 645776732542 in words is "six hundred forty-five billion, seven hundred seventy-six million, seven hundred thirty-two thousand, five hundred forty-two".