2116561642 has 64 divisors (see below), whose sum is σ = 3772790784. Its totient is φ = 881233920.

The previous prime is 2116561633. The next prime is 2116561663. The reversal of 2116561642 is 2461656112.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 2116561598 and 2116561607.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1547643 + ... + 1549009.

It is an arithmetic number, because the mean of its divisors is an integer number (58949856).

Almost surely, 2^2116561642 is an apocalyptic number.

2116561642 is a deficient number, since it is larger than the sum of its proper divisors (1656229142).

2116561642 is a wasteful number, since it uses less digits than its factorization.

2116561642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543.

The product of its digits is 17280, while the sum is 34.

The square root of 2116561642 is about 46006.1043993077. The cubic root of 2116561642 is about 1283.9367813551.

The spelling of 2116561642 in words is "two billion, one hundred sixteen million, five hundred sixty-one thousand, six hundred forty-two".