645051116543254 has 8 divisors (see below), whose sum is σ = 969547299408648. Its totient is φ = 321868683407040.

The previous prime is 645051116543219. The next prime is 645051116543293. The reversal of 645051116543254 is 452345611150546.

It is a happy number.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328437431067 + ... + 328437433030.

It is an arithmetic number, because the mean of its divisors is an integer number (121193412426081).

Almost surely, 2^{645051116543254} is an apocalyptic number.

645051116543254 is a deficient number, since it is larger than the sum of its proper divisors (324496182865394).

645051116543254 is a wasteful number, since it uses less digits than its factorization.

645051116543254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656874864590.

The product of its (nonzero) digits is 8640000, while the sum is 52.

The spelling of 645051116543254 in words is "six hundred forty-five trillion, fifty-one billion, one hundred sixteen million, five hundred forty-three thousand, two hundred fifty-four".