645501431534 has 4 divisors (see below), whose sum is σ = 968252147304. Its totient is φ = 322750715766.

The previous prime is 645501431527. The next prime is 645501431567. The reversal of 645501431534 is 435134105546.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×645501431534² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645501431491 and 645501431500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161375357882 + ... + 161375357885.

It is an arithmetic number, because the mean of its divisors is an integer number (242063036826).

Almost surely, 2^645501431534 is an apocalyptic number.

645501431534 is a deficient number, since it is larger than the sum of its proper divisors (322750715770).

645501431534 is a wasteful number, since it uses less digits than its factorization.

645501431534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322750715769.

The product of its (nonzero) digits is 432000, while the sum is 41.

The spelling of 645501431534 in words is "six hundred forty-five billion, five hundred one million, four hundred thirty-one thousand, five hundred thirty-four".