261157540897 has 8 divisors (see below), whose sum is σ = 285076441152. Its totient is φ = 237268191600.

The previous prime is 261157540883. The next prime is 261157540937. The reversal of 261157540897 is 798045751162.

261157540897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 261157540897 - 2¹⁹ = 261157016609 is a prime.

It is a super-2 number, since 2×261157540897² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261157540877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7369254 + ... + 7404607.

It is an arithmetic number, because the mean of its divisors is an integer number (35634555144).

Almost surely, 2^261157540897 is an apocalyptic number.

It is an amenable number.

261157540897 is a deficient number, since it is larger than the sum of its proper divisors (23918900255).

261157540897 is a wasteful number, since it uses less digits than its factorization.

261157540897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14775479.

The product of its (nonzero) digits is 4233600, while the sum is 55.

The spelling of 261157540897 in words is "two hundred sixty-one billion, one hundred fifty-seven million, five hundred forty thousand, eight hundred ninety-seven".