261430943253 has 32 divisors (see below), whose sum is σ = 359309942400. Its totient is φ = 168955186176.

The previous prime is 261430943239. The next prime is 261430943339. The reversal of 261430943253 is 352349034162.

It is not a de Polignac number, because 261430943253 - 2⁴ = 261430943237 is a prime.

It is a super-2 number, since 2×261430943253² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261430943233) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50185713 + ... + 50190921.

It is an arithmetic number, because the mean of its divisors is an integer number (11228435700).

Almost surely, 2^261430943253 is an apocalyptic number.

It is an amenable number.

261430943253 is a deficient number, since it is larger than the sum of its proper divisors (97878999147).

261430943253 is a wasteful number, since it uses less digits than its factorization.

261430943253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6821.

The product of its (nonzero) digits is 466560, while the sum is 42.

It can be divided in two parts, 2614309 and 43253, that added together give a palindrome (2657562).

The spelling of 261430943253 in words is "two hundred sixty-one billion, four hundred thirty million, nine hundred forty-three thousand, two hundred fifty-three".