645921729046 has 32 divisors (see below), whose sum is σ = 1069137014400. Its totient is φ = 290237206080.

The previous prime is 645921729041. The next prime is 645921729067. The reversal of 645921729046 is 640927129546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645921729041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 259245 + ... + 1165783.

It is an arithmetic number, because the mean of its divisors is an integer number (33410531700).

Almost surely, 2^645921729046 is an apocalyptic number.

645921729046 is a deficient number, since it is larger than the sum of its proper divisors (423215285354).

645921729046 is a wasteful number, since it uses less digits than its factorization.

645921729046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906924.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 645921729046 in words is "six hundred forty-five billion, nine hundred twenty-one million, seven hundred twenty-nine thousand, forty-six".