6619662541 has 6 divisors (see below), whose sum is σ = 6681250730. Its totient is φ = 6558090048.

The previous prime is 6619662527. The next prime is 6619662547. The reversal of 6619662541 is 1452669166.

It can be written as a sum of positive squares in 3 ways, for example, as 5366148516 + 1253514025 = 73254^2 + 35405^2 .

It is not a de Polignac number, because 6619662541 - 2¹⁷ = 6619531469 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6619662491 and 6619662500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6619662547) 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, 845541 + ... + 853333.

Almost surely, 2^6619662541 is an apocalyptic number.

It is an amenable number.

6619662541 is a deficient number, since it is larger than the sum of its proper divisors (61588189).

6619662541 is an frugal number, since it uses more digits than its factorization.

6619662541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15695 (or 7902 counting only the distinct ones).

The product of its digits is 466560, while the sum is 46.

The square root of 6619662541 is about 81361.3086239399. The cubic root of 6619662541 is about 1877.6383637065.

The spelling of 6619662541 in words is "six billion, six hundred nineteen million, six hundred sixty-two thousand, five hundred forty-one".