261664350502 has 16 divisors (see below), whose sum is σ = 406531616400. Its totient is φ = 126164939040.

The previous prime is 261664350457. The next prime is 261664350509. The reversal of 261664350502 is 205053466162.

It is a happy number.

It is a super-3 number, since 3×261664350502³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261664350509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2734377 + ... + 2828452.

It is an arithmetic number, because the mean of its divisors is an integer number (25408226025).

Almost surely, 2^261664350502 is an apocalyptic number.

261664350502 is a deficient number, since it is larger than the sum of its proper divisors (144867265898).

261664350502 is a wasteful number, since it uses less digits than its factorization.

261664350502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5563671.

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 261664350502 in words is "two hundred sixty-one billion, six hundred sixty-four million, three hundred fifty thousand, five hundred two".