261011552502 has 8 divisors (see below), whose sum is σ = 522023105016. Its totient is φ = 87003850832.

The previous prime is 261011552447. The next prime is 261011552509. The reversal of 261011552502 is 205255110162.

It is a sphenic number, since it is the product of 3 distinct primes.

261011552502 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 261011552502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261011552509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21750962703 + ... + 21750962714.

It is an arithmetic number, because the mean of its divisors is an integer number (65252888127).

Almost surely, 2^261011552502 is an apocalyptic number.

261011552502 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261011552502 is a wasteful number, since it uses less digits than its factorization.

261011552502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43501925422.

The product of its (nonzero) digits is 6000, while the sum is 30.

Adding to 261011552502 its reverse (205255110162), we get a palindrome (466266662664).

The spelling of 261011552502 in words is "two hundred sixty-one billion, eleven million, five hundred fifty-two thousand, five hundred two".