19906046761 has 4 divisors (see below), whose sum is σ = 19922218624. Its totient is φ = 19889874900.

The previous prime is 19906046753. The next prime is 19906046767. The reversal of 19906046761 is 16764060991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19906046761 - 2³ = 19906046753 is a prime.

It is a super-2 number, since 2×19906046761² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19906046767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8084085 + ... + 8086546.

It is an arithmetic number, because the mean of its divisors is an integer number (4980554656).

Almost surely, 2^19906046761 is an apocalyptic number.

It is an amenable number.

19906046761 is a deficient number, since it is larger than the sum of its proper divisors (16171863).

19906046761 is a wasteful number, since it uses less digits than its factorization.

19906046761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16171862.

The product of its (nonzero) digits is 489888, while the sum is 49.

The spelling of 19906046761 in words is "nineteen billion, nine hundred six million, forty-six thousand, seven hundred sixty-one".