1641644601 has 16 divisors (see below), whose sum is σ = 2263128000. Its totient is φ = 1057693248.

The previous prime is 1641644597. The next prime is 1641644603. The reversal of 1641644601 is 1064461461.

It is not a de Polignac number, because 1641644601 - 2² = 1641644597 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1641644603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33091 + ... + 66168.

It is an arithmetic number, because the mean of its divisors is an integer number (141445500).

Almost surely, 2^1641644601 is an apocalyptic number.

It is an amenable number.

1641644601 is a deficient number, since it is larger than the sum of its proper divisors (621483399).

1641644601 is a wasteful number, since it uses less digits than its factorization.

1641644601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99448.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 1641644601 is about 40517.2136381563. The cubic root of 1641644601 is about 1179.6677703494.

The spelling of 1641644601 in words is "one billion, six hundred forty-one million, six hundred forty-four thousand, six hundred one".