2978834661 has 24 divisors (see below), whose sum is σ = 4701625344. Its totient is φ = 1802391360.

The previous prime is 2978834587. The next prime is 2978834699. The reversal of 2978834661 is 1664388792.

2978834661 is a `hidden beast` number, since 297 + 8 + 8 + 346 + 6 + 1 = 666.

2978834661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2978834661 - 2¹⁷ = 2978703589 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 2978834598 and 2978834607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2978834561) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36700 + ... + 85466.

It is an arithmetic number, because the mean of its divisors is an integer number (195901056).

Almost surely, 2^2978834661 is an apocalyptic number.

It is an amenable number.

2978834661 is a deficient number, since it is larger than the sum of its proper divisors (1722790683).

2978834661 is a wasteful number, since it uses less digits than its factorization.

2978834661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49401 (or 49398 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The square root of 2978834661 is about 54578.7015327408. The cubic root of 2978834661 is about 1438.8498179515.

The spelling of 2978834661 in words is "two billion, nine hundred seventy-eight million, eight hundred thirty-four thousand, six hundred sixty-one".