51642261551 has 2 divisors, whose sum is σ = 51642261552. Its totient is φ = 51642261550.

The previous prime is 51642261523. The next prime is 51642261557. The reversal of 51642261551 is 15516224615.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51642261551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51642261557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25821130775 + 25821130776.

It is an arithmetic number, because the mean of its divisors is an integer number (25821130776).

Almost surely, 2^51642261551 is an apocalyptic number.

51642261551 is a deficient number, since it is larger than the sum of its proper divisors (1).

51642261551 is an equidigital number, since it uses as much as digits as its factorization.

51642261551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72000, while the sum is 38.

The spelling of 51642261551 in words is "fifty-one billion, six hundred forty-two million, two hundred sixty-one thousand, five hundred fifty-one".