81762553501 has 2 divisors, whose sum is σ = 81762553502. Its totient is φ = 81762553500.

The previous prime is 81762553489. The next prime is 81762553547. The reversal of 81762553501 is 10535526718.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71014255225 + 10748298276 = 266485^2 + 103674^2 .

It is a cyclic number.

It is not a de Polignac number, because 81762553501 - 2²⁷ = 81628335773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81762556501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40881276750 + 40881276751.

It is an arithmetic number, because the mean of its divisors is an integer number (40881276751).

Almost surely, 2^81762553501 is an apocalyptic number.

It is an amenable number.

81762553501 is a deficient number, since it is larger than the sum of its proper divisors (1).

81762553501 is an equidigital number, since it uses as much as digits as its factorization.

81762553501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252000, while the sum is 43.

The spelling of 81762553501 in words is "eighty-one billion, seven hundred sixty-two million, five hundred fifty-three thousand, five hundred one".