42151926779 has 2 divisors, whose sum is σ = 42151926780. Its totient is φ = 42151926778.

The previous prime is 42151926743. The next prime is 42151926811. The reversal of 42151926779 is 97762915124.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42151926779 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42151926779.

It is not a weakly prime, because it can be changed into another prime (42151926079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21075963389 + 21075963390.

It is an arithmetic number, because the mean of its divisors is an integer number (21075963390).

Almost surely, 2^42151926779 is an apocalyptic number.

42151926779 is a deficient number, since it is larger than the sum of its proper divisors (1).

42151926779 is an equidigital number, since it uses as much as digits as its factorization.

42151926779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 53.

The spelling of 42151926779 in words is "forty-two billion, one hundred fifty-one million, nine hundred twenty-six thousand, seven hundred seventy-nine".