261655433135252 has 48 divisors (see below), whose sum is σ = 498211313940480. Its totient is φ = 119517196833792.

The previous prime is 261655433135251. The next prime is 261655433135281. The reversal of 261655433135252 is 252531334556162.

It is a junction number, because it is equal to n+sod(n) for n = 261655433135194 and 261655433135203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261655433135251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 354926093 + ... + 355662539.

It is an arithmetic number, because the mean of its divisors is an integer number (10379402373760).

Almost surely, 2^{261655433135252} is an apocalyptic number.

It is an amenable number.

261655433135252 is a deficient number, since it is larger than the sum of its proper divisors (236555880805228).

261655433135252 is a wasteful number, since it uses less digits than its factorization.

261655433135252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807000 (or 806998 counting only the distinct ones).

The product of its digits is 19440000, while the sum is 53.

The spelling of 261655433135252 in words is "two hundred sixty-one trillion, six hundred fifty-five billion, four hundred thirty-three million, one hundred thirty-five thousand, two hundred fifty-two".