19426790461 has 4 divisors (see below), whose sum is σ = 20921158972. Its totient is φ = 17932421952.

The previous prime is 19426790459. The next prime is 19426790473. The reversal of 19426790461 is 16409762491.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11149248100 + 8277542361 = 105590^2 + 90981^2 .

It is a cyclic number.

It is not a de Polignac number, because 19426790461 - 2¹ = 19426790459 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19426794461) 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, 747184236 + ... + 747184261.

It is an arithmetic number, because the mean of its divisors is an integer number (5230289743).

Almost surely, 2^19426790461 is an apocalyptic number.

It is an amenable number.

19426790461 is a deficient number, since it is larger than the sum of its proper divisors (1494368511).

19426790461 is a wasteful number, since it uses less digits than its factorization.

19426790461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1494368510.

The product of its (nonzero) digits is 653184, while the sum is 49.

The spelling of 19426790461 in words is "nineteen billion, four hundred twenty-six million, seven hundred ninety thousand, four hundred sixty-one".