645651156546 has 64 divisors (see below), whose sum is σ = 1607518085760. Its totient is φ = 190363970880.

The previous prime is 645651156541. The next prime is 645651156547.

645651156546 is a `hidden beast` number, since 6 + 4 + 5 + 65 + 11 + 565 + 4 + 6 = 666.

645651156546 is nontrivially palindromic in base 10.

645651156546 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 a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 645651156492 and 645651156501.

It is not an unprimeable number, because it can be changed into a prime (645651156541) 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, 14666601 + ... + 14710556.

It is an arithmetic number, because the mean of its divisors is an integer number (25117470090).

Almost surely, 2^645651156546 is an apocalyptic number.

645651156546 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

645651156546 is an abundant number, since it is smaller than the sum of its proper divisors (961866929214).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645651156546 is a wasteful number, since it uses less digits than its factorization.

645651156546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29377216 (or 29377210 counting only the distinct ones).

The product of its digits is 12960000, while the sum is 54.

The spelling of 645651156546 in words is "six hundred forty-five billion, six hundred fifty-one million, one hundred fifty-six thousand, five hundred forty-six".