2666957430981 has 8 divisors (see below), whose sum is σ = 3555954454144. Its totient is φ = 1777966014240.

The previous prime is 2666957430961. The next prime is 2666957430983. The reversal of 2666957430981 is 1890347596662.

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

It is not a de Polignac number, because 2666957430981 - 2¹⁵ = 2666957398213 is a prime.

It is a super-2 number, since 2×2666957430981² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2666957430983) 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, 125725 + ... + 2312946.

It is an arithmetic number, because the mean of its divisors is an integer number (444494306768).

It is a 1-persistent number, because it is pandigital, but 2⋅2666957430981 = 5333914861962 is not.

Almost surely, 2^{2666957430981} is an apocalyptic number.

It is an amenable number.

2666957430981 is a deficient number, since it is larger than the sum of its proper divisors (888997023163).

2666957430981 is a wasteful number, since it uses less digits than its factorization.

2666957430981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2803211.

The product of its (nonzero) digits is 117573120, while the sum is 66.

The spelling of 2666957430981 in words is "two trillion, six hundred sixty-six billion, nine hundred fifty-seven million, four hundred thirty thousand, nine hundred eighty-one".