19778701387990 has 16 divisors (see below), whose sum is σ = 35604785930400. Its totient is φ = 7910786459200.

The previous prime is 19778701387987. The next prime is 19778701388009. The reversal of 19778701387990 is 9978310787791.

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, 86642311 + ... + 86870290.

It is an arithmetic number, because the mean of its divisors is an integer number (2225299120650).

Almost surely, 2^{19778701387990} is an apocalyptic number.

19778701387990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19778701387990 is a deficient number, since it is larger than the sum of its proper divisors (15826084542410).

19778701387990 is a wasteful number, since it uses less digits than its factorization.

19778701387990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173524007.

The product of its (nonzero) digits is 336063168, while the sum is 76.

The spelling of 19778701387990 in words is "nineteen trillion, seven hundred seventy-eight billion, seven hundred one million, three hundred eighty-seven thousand, nine hundred ninety".