19621046506 has 4 divisors (see below), whose sum is σ = 29431569762. Its totient is φ = 9810523252.

The previous prime is 19621046479. The next prime is 19621046513. The reversal of 19621046506 is 60564012691.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10717425625 + 8903620881 = 103525^2 + 94359^2 .

It is a super-2 number, since 2×19621046506² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4905261625 + ... + 4905261628.

Almost surely, 2^19621046506 is an apocalyptic number.

19621046506 is a deficient number, since it is larger than the sum of its proper divisors (9810523256).

19621046506 is an equidigital number, since it uses as much as digits as its factorization.

19621046506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9810523255.

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 19621046506 in words is "nineteen billion, six hundred twenty-one million, forty-six thousand, five hundred six".