1967650061 has 8 divisors (see below), whose sum is σ = 2120086584. Its totient is φ = 1815367680.

The previous prime is 1967650021. The next prime is 1967650063. The reversal of 1967650061 is 1600567691.

It can be written as a sum of positive squares in 4 ways, for example, as 691374436 + 1276275625 = 26294^2 + 35725^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1967650061 - 2²² = 1963455757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1967650063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11300 + ... + 63741.

It is an arithmetic number, because the mean of its divisors is an integer number (265010823).

Almost surely, 2^1967650061 is an apocalyptic number.

It is an amenable number.

1967650061 is a deficient number, since it is larger than the sum of its proper divisors (152436523).

1967650061 is a wasteful number, since it uses less digits than its factorization.

1967650061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77071.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 1967650061 is about 44358.2017331632. The cubic root of 1967650061 is about 1253.0910298074.

The spelling of 1967650061 in words is "one billion, nine hundred sixty-seven million, six hundred fifty thousand, sixty-one".