61226902178 has 54 divisors (see below), whose sum is σ = 102141295731. Its totient is φ = 27513210816.

The previous prime is 61226902153. The next prime is 61226902189. The reversal of 61226902178 is 87120962216.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 5720955769 + 55505946409 = 75637^2 + 235597^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=174967.

It is a super-2 number, since 2×61226902178² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 195612950 + ... + 195613262.

Almost surely, 2^61226902178 is an apocalyptic number.

61226902178 is a deficient number, since it is larger than the sum of its proper divisors (40914393553).

61226902178 is an equidigital number, since it uses as much as digits as its factorization.

61226902178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 61226902178 in words is "sixty-one billion, two hundred twenty-six million, nine hundred two thousand, one hundred seventy-eight".