19978358407 has 8 divisors (see below), whose sum is σ = 22851180576. Its totient is φ = 17110228992.

The previous prime is 19978358327. The next prime is 19978358423. The reversal of 19978358407 is 70485387991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19978358407 - 2³¹ = 17830874759 is a prime.

It is a super-3 number, since 3×19978358407³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19978358497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1164058 + ... + 1181095.

It is an arithmetic number, because the mean of its divisors is an integer number (2856397572).

Almost surely, 2^19978358407 is an apocalyptic number.

19978358407 is a deficient number, since it is larger than the sum of its proper divisors (2872822169).

19978358407 is a wasteful number, since it uses less digits than its factorization.

19978358407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2346377.

The product of its (nonzero) digits is 15240960, while the sum is 61.

The spelling of 19978358407 in words is "nineteen billion, nine hundred seventy-eight million, three hundred fifty-eight thousand, four hundred seven".