266561512601 has 8 divisors (see below), whose sum is σ = 279824006400. Its totient is φ = 253590502320.

The previous prime is 266561512577. The next prime is 266561512619. The reversal of 266561512601 is 106215165662.

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

It is a cyclic number.

It is not a de Polignac number, because 266561512601 - 2³⁴ = 249381643417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266561512631) 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, 72869006 + ... + 72872663.

It is an arithmetic number, because the mean of its divisors is an integer number (34978000800).

Almost surely, 2^266561512601 is an apocalyptic number.

It is an amenable number.

266561512601 is a deficient number, since it is larger than the sum of its proper divisors (13262493799).

266561512601 is a wasteful number, since it uses less digits than its factorization.

266561512601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145741759.

The product of its (nonzero) digits is 129600, while the sum is 41.

The spelling of 266561512601 in words is "two hundred sixty-six billion, five hundred sixty-one million, five hundred twelve thousand, six hundred one".