2578149981 has 48 divisors (see below), whose sum is σ = 4110986880. Its totient is φ = 1544002560.

The previous prime is 2578149949. The next prime is 2578149983. The reversal of 2578149981 is 1899418752.

It is a happy number.

2578149981 is a `hidden beast` number, since 2 + 5 + 78 + 1 + 499 + 81 = 666.

It is not a de Polignac number, because 2578149981 - 2⁵ = 2578149949 is a prime.

It is a super-2 number, since 2×2578149981² = 13293714649060600722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2578149983) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5872560 + ... + 5872998.

It is an arithmetic number, because the mean of its divisors is an integer number (85645560).

Almost surely, 2^2578149981 is an apocalyptic number.

It is an amenable number.

2578149981 is a deficient number, since it is larger than the sum of its proper divisors (1532836899).

2578149981 is a wasteful number, since it uses less digits than its factorization.

2578149981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026 (or 1023 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 54.

The square root of 2578149981 is about 50775.4860242617. The cubic root of 2578149981 is about 1371.2060668923.

The spelling of 2578149981 in words is "two billion, five hundred seventy-eight million, one hundred forty-nine thousand, nine hundred eighty-one".