261562252037 has 2 divisors, whose sum is σ = 261562252038. Its totient is φ = 261562252036.

The previous prime is 261562252013. The next prime is 261562252073. The reversal of 261562252037 is 730252265162.

Together with next prime (261562252073) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215765824036 + 45796428001 = 464506^2 + 214001^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261562252037 is a prime.

It is a super-3 number, since 3×261562252037³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 261562251985 and 261562252003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261562252097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130781126018 + 130781126019.

It is an arithmetic number, because the mean of its divisors is an integer number (130781126019).

Almost surely, 2^261562252037 is an apocalyptic number.

It is an amenable number.

261562252037 is a deficient number, since it is larger than the sum of its proper divisors (1).

261562252037 is an equidigital number, since it uses as much as digits as its factorization.

261562252037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 41.

The spelling of 261562252037 in words is "two hundred sixty-one billion, five hundred sixty-two million, two hundred fifty-two thousand, thirty-seven".