646546151 has 4 divisors (see below), whose sum is σ = 661582152. Its totient is φ = 631510152.

The previous prime is 646546067. The next prime is 646546157. The reversal of 646546151 is 151645646.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646546151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646546157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7517936 + ... + 7518021.

It is an arithmetic number, because the mean of its divisors is an integer number (165395538).

Almost surely, 2^646546151 is an apocalyptic number.

646546151 is a deficient number, since it is larger than the sum of its proper divisors (15036001).

646546151 is a wasteful number, since it uses less digits than its factorization.

646546151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15036000.

The product of its digits is 86400, while the sum is 38.

The square root of 646546151 is about 25427.2717962427. The cubic root of 646546151 is about 864.7020930531.

The spelling of 646546151 in words is "six hundred forty-six million, five hundred forty-six thousand, one hundred fifty-one".