7629521257 has 2 divisors, whose sum is σ = 7629521258. Its totient is φ = 7629521256.

The previous prime is 7629521219. The next prime is 7629521293. The reversal of 7629521257 is 7521259267.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7372111321 + 257409936 = 85861^2 + 16044^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7629521257 is a prime.

It is a super-2 number, since 2×7629521257² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7629521357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3814760628 + 3814760629.

It is an arithmetic number, because the mean of its divisors is an integer number (3814760629).

Almost surely, 2^7629521257 is an apocalyptic number.

It is an amenable number.

7629521257 is a deficient number, since it is larger than the sum of its proper divisors (1).

7629521257 is an equidigital number, since it uses as much as digits as its factorization.

7629521257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 529200, while the sum is 46.

The square root of 7629521257 is about 87347.1307885955. The cubic root of 7629521257 is about 1968.6375401595.

The spelling of 7629521257 in words is "seven billion, six hundred twenty-nine million, five hundred twenty-one thousand, two hundred fifty-seven".