261161263502 has 16 divisors (see below), whose sum is σ = 418514519040. Its totient is φ = 121861578168.

The previous prime is 261161263481. The next prime is 261161263523. The reversal of 261161263502 is 205362161162.

It is an interprime number because it is at equal distance from previous prime (261161263481) and next prime (261161263523).

It is a super-2 number, since 2×261161263502² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51285998 + ... + 51291089.

It is an arithmetic number, because the mean of its divisors is an integer number (26157157440).

Almost surely, 2^261161263502 is an apocalyptic number.

261161263502 is a deficient number, since it is larger than the sum of its proper divisors (157353255538).

261161263502 is a wasteful number, since it uses less digits than its factorization.

261161263502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102577175.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 261161263502 in words is "two hundred sixty-one billion, one hundred sixty-one million, two hundred sixty-three thousand, five hundred two".