646633461 has 4 divisors (see below), whose sum is σ = 862177952. Its totient is φ = 431088972.

The previous prime is 646633409. The next prime is 646633469. The reversal of 646633461 is 164336646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 646633461 - 2⁶ = 646633397 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 (646633469) 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, 107772241 + ... + 107772246.

It is an arithmetic number, because the mean of its divisors is an integer number (215544488).

Almost surely, 2^646633461 is an apocalyptic number.

It is an amenable number.

646633461 is a deficient number, since it is larger than the sum of its proper divisors (215544491).

646633461 is a wasteful number, since it uses less digits than its factorization.

646633461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215544490.

The product of its digits is 186624, while the sum is 39.

The square root of 646633461 is about 25428.9885956953. The cubic root of 646633461 is about 864.7410146065.

The spelling of 646633461 in words is "six hundred forty-six million, six hundred thirty-three thousand, four hundred sixty-one".