61220662707 has 4 divisors (see below), whose sum is σ = 81627550280. Its totient is φ = 40813775136.

The previous prime is 61220662673. The next prime is 61220662747. The reversal of 61220662707 is 70726602216.

It is a happy number.

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

It is not a de Polignac number, because 61220662707 - 2⁷ = 61220662579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61220662747) 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, 10203443782 + ... + 10203443787.

It is an arithmetic number, because the mean of its divisors is an integer number (20406887570).

Almost surely, 2^61220662707 is an apocalyptic number.

61220662707 is a deficient number, since it is larger than the sum of its proper divisors (20406887573).

61220662707 is a wasteful number, since it uses less digits than its factorization.

61220662707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20406887572.

The product of its (nonzero) digits is 84672, while the sum is 39.

The spelling of 61220662707 in words is "sixty-one billion, two hundred twenty million, six hundred sixty-two thousand, seven hundred seven".