73209887957 has 2 divisors, whose sum is σ = 73209887958. Its totient is φ = 73209887956.

The previous prime is 73209887951. The next prime is 73209888001. The reversal of 73209887957 is 75978890237.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43147182961 + 30062704996 = 207719^2 + 173386^2 .

It is an emirp because it is prime and its reverse (75978890237) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73209887957 - 2⁴ = 73209887941 is a prime.

It is a super-3 number, since 3×73209887957³ (a number of 34 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 73209887893 and 73209887902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73209887951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36604943978 + 36604943979.

It is an arithmetic number, because the mean of its divisors is an integer number (36604943979).

Almost surely, 2^73209887957 is an apocalyptic number.

It is an amenable number.

73209887957 is a deficient number, since it is larger than the sum of its proper divisors (1).

73209887957 is an equidigital number, since it uses as much as digits as its factorization.

73209887957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53343360, while the sum is 65.

The spelling of 73209887957 in words is "seventy-three billion, two hundred nine million, eight hundred eighty-seven thousand, nine hundred fifty-seven".