61742671217 has 4 divisors (see below), whose sum is σ = 61762457316. Its totient is φ = 61722885120.

The previous prime is 61742671163. The next prime is 61742671219. The reversal of 61742671217 is 71217624716.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18168613681 + 43574057536 = 134791^2 + 208744^2 .

It is a cyclic number.

It is not a de Polignac number, because 61742671217 - 2⁸ = 61742670961 is a prime.

It is a super-2 number, since 2×61742671217² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61742671219) 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, 9888368 + ... + 9894609.

It is an arithmetic number, because the mean of its divisors is an integer number (15440614329).

Almost surely, 2^61742671217 is an apocalyptic number.

It is an amenable number.

61742671217 is a deficient number, since it is larger than the sum of its proper divisors (19786099).

61742671217 is a wasteful number, since it uses less digits than its factorization.

61742671217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19786098.

The product of its digits is 197568, while the sum is 44.

The spelling of 61742671217 in words is "sixty-one billion, seven hundred forty-two million, six hundred seventy-one thousand, two hundred seventeen".