736640979421 has 2 divisors, whose sum is σ = 736640979422. Its totient is φ = 736640979420.

The previous prime is 736640979419. The next prime is 736640979461. The reversal of 736640979421 is 124979046637.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 624021002500 + 112619976921 = 789950^2 + 335589^2 .

It is a cyclic number.

It is not a de Polignac number, because 736640979421 - 2¹ = 736640979419 is a prime.

Together with 736640979419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (736640979461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 368320489710 + 368320489711.

It is an arithmetic number, because the mean of its divisors is an integer number (368320489711).

Almost surely, 2^736640979421 is an apocalyptic number.

It is an amenable number.

736640979421 is a deficient number, since it is larger than the sum of its proper divisors (1).

736640979421 is an equidigital number, since it uses as much as digits as its factorization.

736640979421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13716864, while the sum is 58.

The spelling of 736640979421 in words is "seven hundred thirty-six billion, six hundred forty million, nine hundred seventy-nine thousand, four hundred twenty-one".