61122277890 has 64 divisors (see below), whose sum is σ = 163820257920. Its totient is φ = 16216522560.

The previous prime is 61122277841. The next prime is 61122277891. The reversal of 61122277890 is 9877222116.

It is a happy number.

61122277890 is a `hidden beast` number, since 611 + 2 + 2 + 27 + 7 + 8 + 9 + 0 = 666.

61122277890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (61122277891) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 521376 + ... + 627755.

It is an arithmetic number, because the mean of its divisors is an integer number (2559691530).

Almost surely, 2^61122277890 is an apocalyptic number.

61122277890 is an abundant number, since it is smaller than the sum of its proper divisors (102697980030).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61122277890 is a wasteful number, since it uses less digits than its factorization.

61122277890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1149344 (or 1149338 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The spelling of 61122277890 in words is "sixty-one billion, one hundred twenty-two million, two hundred seventy-seven thousand, eight hundred ninety".