75420815357 has 2 divisors, whose sum is σ = 75420815358. Its totient is φ = 75420815356.

The previous prime is 75420815339. The next prime is 75420815423. The reversal of 75420815357 is 75351802457.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60329675641 + 15091139716 = 245621^2 + 122846^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75420815357 is a prime.

It is a super-2 number, since 2×75420815357² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75420805357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37710407678 + 37710407679.

It is an arithmetic number, because the mean of its divisors is an integer number (37710407679).

Almost surely, 2^75420815357 is an apocalyptic number.

It is an amenable number.

75420815357 is a deficient number, since it is larger than the sum of its proper divisors (1).

75420815357 is an equidigital number, since it uses as much as digits as its factorization.

75420815357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1176000, while the sum is 47.

The spelling of 75420815357 in words is "seventy-five billion, four hundred twenty million, eight hundred fifteen thousand, three hundred fifty-seven".