645251654 has 8 divisors (see below), whose sum is σ = 969280248. Its totient is φ = 322158240.

The previous prime is 645251641. The next prime is 645251657. The reversal of 645251654 is 456152546.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645251657) 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, 232067 + ... + 234830.

It is an arithmetic number, because the mean of its divisors is an integer number (121160031).

Almost surely, 2^645251654 is an apocalyptic number.

645251654 is a deficient number, since it is larger than the sum of its proper divisors (324028594).

645251654 is a wasteful number, since it uses less digits than its factorization.

645251654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467590.

The product of its digits is 144000, while the sum is 38.

The square root of 645251654 is about 25401.8041485246. The cubic root of 645251654 is about 864.1246131921.

The spelling of 645251654 in words is "six hundred forty-five million, two hundred fifty-one thousand, six hundred fifty-four".