261535117053570 has 64 divisors (see below), whose sum is σ = 667059309974016. Its totient is φ = 65397971496960.

The previous prime is 261535117053559. The next prime is 261535117053571. The reversal of 261535117053570 is 75350711535162.

It is a super-2 number, since 2×261535117053570² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (261535117053571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 946012999 + ... + 946289418.

It is an arithmetic number, because the mean of its divisors is an integer number (10422801718344).

Almost surely, 2^{261535117053570} is an apocalyptic number.

261535117053570 is an abundant number, since it is smaller than the sum of its proper divisors (405524192920446).

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

261535117053570 is a wasteful number, since it uses less digits than its factorization.

261535117053570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1892302715.

The product of its (nonzero) digits is 3307500, while the sum is 51.

The spelling of 261535117053570 in words is "two hundred sixty-one trillion, five hundred thirty-five billion, one hundred seventeen million, fifty-three thousand, five hundred seventy".