261564325016422 has 8 divisors (see below), whose sum is σ = 392346642907872. Its totient is φ = 130782110713800.

The previous prime is 261564325016381. The next prime is 261564325016431. The reversal of 261564325016422 is 224610523465162.

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

It is a super-2 number, since 2×261564325016422² (a number of 30 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 3 ways as a sum of consecutive naturals, for example, 19242654 + ... + 29889937.

It is an arithmetic number, because the mean of its divisors is an integer number (49043330363484).

Almost surely, 2^{261564325016422} is an apocalyptic number.

261564325016422 is a deficient number, since it is larger than the sum of its proper divisors (130782317891450).

261564325016422 is a wasteful number, since it uses less digits than its factorization.

261564325016422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51794414.

The product of its (nonzero) digits is 4147200, while the sum is 49.

The spelling of 261564325016422 in words is "two hundred sixty-one trillion, five hundred sixty-four billion, three hundred twenty-five million, sixteen thousand, four hundred twenty-two".