643476061 has 16 divisors (see below), whose sum is σ = 689629248. Its totient is φ = 598291200.

The previous prime is 643476049. The next prime is 643476073. The reversal of 643476061 is 160674346.

It is an interprime number because it is at equal distance from previous prime (643476049) and next prime (643476073).

It is not a de Polignac number, because 643476061 - 2²¹ = 641378909 is a prime.

It is a super-2 number, since 2×643476061² = 828122882160151442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 643476061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643476161) 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, 629731 + ... + 630751.

It is an arithmetic number, because the mean of its divisors is an integer number (43101828).

Almost surely, 2^643476061 is an apocalyptic number.

It is an amenable number.

643476061 is a deficient number, since it is larger than the sum of its proper divisors (46153187).

643476061 is a wasteful number, since it uses less digits than its factorization.

643476061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1452.

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 643476061 is about 25366.8299359616. The cubic root of 643476061 is about 863.3312570160.

The spelling of 643476061 in words is "six hundred forty-three million, four hundred seventy-six thousand, sixty-one".