19557372949 has 4 divisors (see below), whose sum is σ = 20407693536. Its totient is φ = 18707052364.

The previous prime is 19557372941. The next prime is 19557372953. The reversal of 19557372949 is 94927375591.

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 19557372949 - 2³ = 19557372941 is a prime.

It is a super-3 number, since 3×19557372949³ (a number of 32 digits) contains 333 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 (19557372941) 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, 425160259 + ... + 425160304.

It is an arithmetic number, because the mean of its divisors is an integer number (5101923384).

Almost surely, 2^19557372949 is an apocalyptic number.

It is an amenable number.

19557372949 is a deficient number, since it is larger than the sum of its proper divisors (850320587).

19557372949 is an equidigital number, since it uses as much as digits as its factorization.

19557372949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850320586.

The product of its digits is 21432600, while the sum is 61.

The spelling of 19557372949 in words is "nineteen billion, five hundred fifty-seven million, three hundred seventy-two thousand, nine hundred forty-nine".