1272837621997 has 2 divisors, whose sum is σ = 1272837621998. Its totient is φ = 1272837621996.

The previous prime is 1272837621983. The next prime is 1272837622097. The reversal of 1272837621997 is 7991267382721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1129871206116 + 142966415881 = 1062954^2 + 378109^2 .

It is a cyclic number.

It is not a de Polignac number, because 1272837621997 - 2¹⁹ = 1272837097709 is a prime.

It is a super-2 number, since 2×1272837621997² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1272837621907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636418810998 + 636418810999.

It is an arithmetic number, because the mean of its divisors is an integer number (636418810999).

Almost surely, 2^{1272837621997} is an apocalyptic number.

It is an amenable number.

1272837621997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272837621997 is an equidigital number, since it uses as much as digits as its factorization.

1272837621997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32006016, while the sum is 64.

The spelling of 1272837621997 in words is "one trillion, two hundred seventy-two billion, eight hundred thirty-seven million, six hundred twenty-one thousand, nine hundred ninety-seven".