4158778681 has 4 divisors (see below), whose sum is σ = 4292932864. Its totient is φ = 4024624500.

The previous prime is 4158778633. The next prime is 4158778693. The reversal of 4158778681 is 1868778514.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1868778514 = 2 ⋅934389257.

It is a cyclic number.

It is not a de Polignac number, because 4158778681 - 2¹³ = 4158770489 is a prime.

It is a super-2 number, since 2×4158778681² = 34590880235080199522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4158778601) 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, 67077045 + ... + 67077106.

It is an arithmetic number, because the mean of its divisors is an integer number (1073233216).

Almost surely, 2^4158778681 is an apocalyptic number.

It is an amenable number.

4158778681 is a deficient number, since it is larger than the sum of its proper divisors (134154183).

4158778681 is a wasteful number, since it uses less digits than its factorization.

4158778681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134154182.

The product of its digits is 3010560, while the sum is 55.

The square root of 4158778681 is about 64488.5934177510. The cubic root of 4158778681 is about 1608.1328973651.

The spelling of 4158778681 in words is "four billion, one hundred fifty-eight million, seven hundred seventy-eight thousand, six hundred eighty-one".