61998169863408 has 40 divisors (see below), whose sum is σ = 162417740777856. Its totient is φ = 20374985400000.

The previous prime is 61998169863313. The next prime is 61998169863431. The reversal of 61998169863408 is 80436896189916.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9095972218 + ... + 9095979033.

Almost surely, 2^{61998169863408} is an apocalyptic number.

It is an amenable number.

61998169863408 is an abundant number, since it is smaller than the sum of its proper divisors (100419570914448).

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

61998169863408 is a wasteful number, since it uses less digits than its factorization.

61998169863408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18191951333 (or 18191951327 counting only the distinct ones).

The product of its (nonzero) digits is 967458816, while the sum is 78.

The spelling of 61998169863408 in words is "sixty-one trillion, nine hundred ninety-eight billion, one hundred sixty-nine million, eight hundred sixty-three thousand, four hundred eight".