19479549705990 has 64 divisors (see below), whose sum is σ = 53685266192640. Its totient is φ = 4473772179840.

The previous prime is 19479549705989. The next prime is 19479549706007. The reversal of 19479549705990 is 9950794597491.

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, 1553386849 + ... + 1553399388.

It is an arithmetic number, because the mean of its divisors is an integer number (838832284260).

Almost surely, 2^{19479549705990} is an apocalyptic number.

19479549705990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19479549705990 is an abundant number, since it is smaller than the sum of its proper divisors (34205716486650).

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

19479549705990 is a wasteful number, since it uses less digits than its factorization.

19479549705990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3106786277.

The product of its (nonzero) digits is 1157360400, while the sum is 78.

The spelling of 19479549705990 in words is "nineteen trillion, four hundred seventy-nine billion, five hundred forty-nine million, seven hundred five thousand, nine hundred ninety".