6415984981 has 6 divisors (see below), whose sum is σ = 7463492790. Its totient is φ = 5499415656.

The previous prime is 6415984957. The next prime is 6415985003. The reversal of 6415984981 is 1894895146.

It can be written as a sum of positive squares in only one way, i.e., 3632472900 + 2783512081 = 60270^2 + 52759^2 .

It is not a de Polignac number, because 6415984981 - 2²¹ = 6413887829 is a prime.

It is a super-2 number, since 2×6415984981² = 82329726552835140722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6415984901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 65469186 + ... + 65469283.

It is an arithmetic number, because the mean of its divisors is an integer number (1243915465).

Almost surely, 2^6415984981 is an apocalyptic number.

It is an amenable number.

6415984981 is a deficient number, since it is larger than the sum of its proper divisors (1047507809).

6415984981 is a wasteful number, since it uses less digits than its factorization.

6415984981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130938483 (or 130938476 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 55.

The square root of 6415984981 is about 80099.8438263147. The cubic root of 6415984981 is about 1858.1799922611.

The spelling of 6415984981 in words is "six billion, four hundred fifteen million, nine hundred eighty-four thousand, nine hundred eighty-one".