61771778026 has 16 divisors (see below), whose sum is σ = 105910435584. Its totient is φ = 26469629424.

The previous prime is 61771778023. The next prime is 61771778083. The reversal of 61771778026 is 62087717716.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (61771778023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235285 + ... + 422968.

It is an arithmetic number, because the mean of its divisors is an integer number (6619402224).

Almost surely, 2^61771778026 is an apocalyptic number.

61771778026 is a deficient number, since it is larger than the sum of its proper divisors (44138657558).

61771778026 is a wasteful number, since it uses less digits than its factorization.

61771778026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664965.

The product of its (nonzero) digits is 1382976, while the sum is 52.

The spelling of 61771778026 in words is "sixty-one billion, seven hundred seventy-one million, seven hundred seventy-eight thousand, twenty-six".