645087709486 has 16 divisors (see below), whose sum is σ = 1065463476480. Its totient is φ = 290481295480.

The previous prime is 645087709463. The next prime is 645087709531. The reversal of 645087709486 is 684907780546.

It is a super-2 number, since 2×645087709486² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137017126 + ... + 137021833.

It is an arithmetic number, because the mean of its divisors is an integer number (66591467280).

Almost surely, 2^645087709486 is an apocalyptic number.

645087709486 is a deficient number, since it is larger than the sum of its proper divisors (420375766994).

645087709486 is a wasteful number, since it uses less digits than its factorization.

645087709486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274039079.

The product of its (nonzero) digits is 81285120, while the sum is 64.

The spelling of 645087709486 in words is "six hundred forty-five billion, eighty-seven million, seven hundred nine thousand, four hundred eighty-six".