1257621223633 has 2 divisors, whose sum is σ = 1257621223634. Its totient is φ = 1257621223632.

The previous prime is 1257621223601. The next prime is 1257621223687. The reversal of 1257621223633 is 3363221267521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 897731615169 + 359889608464 = 947487^2 + 599908^2 .

It is a cyclic number.

It is not a de Polignac number, because 1257621223633 - 2⁵ = 1257621223601 is a prime.

It is a super-2 number, since 2×1257621223633² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1257621223633.

It is not a weakly prime, because it can be changed into another prime (1257621223693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628810611816 + 628810611817.

It is an arithmetic number, because the mean of its divisors is an integer number (628810611817).

Almost surely, 2^{1257621223633} is an apocalyptic number.

It is an amenable number.

1257621223633 is a deficient number, since it is larger than the sum of its proper divisors (1).

1257621223633 is an equidigital number, since it uses as much as digits as its factorization.

1257621223633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 43.

The spelling of 1257621223633 in words is "one trillion, two hundred fifty-seven billion, six hundred twenty-one million, two hundred twenty-three thousand, six hundred thirty-three".