19979043951 has 8 divisors (see below), whose sum is σ = 28040763520. Its totient is φ = 12618343512.

The previous prime is 19979043941. The next prime is 19979043961. The reversal of 19979043951 is 15934097991.

It is an interprime number because it is at equal distance from previous prime (19979043941) and next prime (19979043961).

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

It is not a de Polignac number, because 19979043951 - 2¹⁵ = 19979011183 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57), and also a Moran number because the ratio is a prime number: 350509543 = 19979043951 / (1 + 9 + 9 + 7 + 9 + 0 + 4 + 3 + 9 + 5 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19979043891 and 19979043900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19979043901) 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, 175254715 + ... + 175254828.

It is an arithmetic number, because the mean of its divisors is an integer number (3505095440).

Almost surely, 2^19979043951 is an apocalyptic number.

19979043951 is a deficient number, since it is larger than the sum of its proper divisors (8061719569).

19979043951 is a wasteful number, since it uses less digits than its factorization.

19979043951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350509565.

The product of its (nonzero) digits is 2755620, while the sum is 57.

The spelling of 19979043951 in words is "nineteen billion, nine hundred seventy-nine million, forty-three thousand, nine hundred fifty-one".