19550437679 has 4 divisors (see below), whose sum is σ = 19550742576. Its totient is φ = 19550132784.

The previous prime is 19550437637. The next prime is 19550437681. The reversal of 19550437679 is 97673405591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97673405591 = 3433 ⋅28451327.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19550437679 is a prime.

It is a super-2 number, since 2×19550437679² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19550431679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14894 + ... + 198299.

It is an arithmetic number, because the mean of its divisors is an integer number (4887685644).

Almost surely, 2^19550437679 is an apocalyptic number.

19550437679 is a deficient number, since it is larger than the sum of its proper divisors (304897).

19550437679 is an equidigital number, since it uses as much as digits as its factorization.

19550437679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304896.

The product of its (nonzero) digits is 7144200, while the sum is 56.

The spelling of 19550437679 in words is "nineteen billion, five hundred fifty million, four hundred thirty-seven thousand, six hundred seventy-nine".