61669918340 has 12 divisors (see below), whose sum is σ = 129506828556. Its totient is φ = 24667967328.

The previous prime is 61669918333. The next prime is 61669918367. The reversal of 61669918340 is 4381996616.

It can be written as a sum of positive squares in 2 ways, for example, as 38046843136 + 23623075204 = 195056^2 + 153698^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1541747939 + ... + 1541747978.

It is an arithmetic number, because the mean of its divisors is an integer number (10792235713).

Almost surely, 2^61669918340 is an apocalyptic number.

It is an amenable number.

61669918340 is an abundant number, since it is smaller than the sum of its proper divisors (67836910216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61669918340 is a wasteful number, since it uses less digits than its factorization.

61669918340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3083495926 (or 3083495924 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 53.

The spelling of 61669918340 in words is "sixty-one billion, six hundred sixty-nine million, nine hundred eighteen thousand, three hundred forty".