645131942427 has 32 divisors (see below), whose sum is σ = 1004055109632. Its totient is φ = 360774245664.

The previous prime is 645131942423. The next prime is 645131942449. The reversal of 645131942427 is 724249131546.

645131942427 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645131942427 - 2² = 645131942423 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645131942423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19868868 + ... + 19901310.

It is an arithmetic number, because the mean of its divisors is an integer number (31376722176).

Almost surely, 2^645131942427 is an apocalyptic number.

645131942427 is a deficient number, since it is larger than the sum of its proper divisors (358923167205).

645131942427 is a wasteful number, since it uses less digits than its factorization.

645131942427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52647.

The product of its digits is 1451520, while the sum is 48.

The spelling of 645131942427 in words is "six hundred forty-five billion, one hundred thirty-one million, nine hundred forty-two thousand, four hundred twenty-seven".