2554683451981 has 4 divisors (see below), whose sum is σ = 2563710602272. Its totient is φ = 2545656301692.

The previous prime is 2554683451963. The next prime is 2554683451993. The reversal of 2554683451981 is 1891543864552.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2554683451981 - 2¹⁷ = 2554683320909 is a prime.

It is a super-2 number, since 2×2554683451981² (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 (2554683451381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4513574721 + ... + 4513575286.

It is an arithmetic number, because the mean of its divisors is an integer number (640927650568).

Almost surely, 2^{2554683451981} is an apocalyptic number.

It is an amenable number.

2554683451981 is a deficient number, since it is larger than the sum of its proper divisors (9027150291).

2554683451981 is an equidigital number, since it uses as much as digits as its factorization.

2554683451981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9027150290.

The product of its digits is 41472000, while the sum is 61.

The spelling of 2554683451981 in words is "two trillion, five hundred fifty-four billion, six hundred eighty-three million, four hundred fifty-one thousand, nine hundred eighty-one".