61899106093440 has 256 divisors, whose sum is σ = 245988655971840. Its totient is φ = 12862151884800.

The previous prime is 61899106093439. The next prime is 61899106093459. The reversal of 61899106093440 is 4439060199816.

It is a super-3 number, since 3×61899106093440³ (a number of 42 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 209197081 + ... + 209492760.

It is an arithmetic number, because the mean of its divisors is an integer number (960893187390).

Almost surely, 2^{61899106093440} is an apocalyptic number.

61899106093440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61899106093440 is an abundant number, since it is smaller than the sum of its proper divisors (184089549878400).

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

61899106093440 is a wasteful number, since it uses less digits than its factorization.

61899106093440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418689881 (or 418689869 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 60.

The spelling of 61899106093440 in words is "sixty-one trillion, eight hundred ninety-nine billion, one hundred six million, ninety-three thousand, four hundred forty".