61154547890 has 16 divisors (see below), whose sum is σ = 110088053208. Its totient is φ = 24459626496.

The previous prime is 61154547863. The next prime is 61154547911. The reversal of 61154547890 is 9874545116.

It can be written as a sum of positive squares in 4 ways, for example, as 49756209721 + 11398338169 = 223061^2 + 106763^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154457 + ... + 382316.

Almost surely, 2^61154547890 is an apocalyptic number.

61154547890 is a deficient number, since it is larger than the sum of its proper divisors (48933505318).

61154547890 is a wasteful number, since it uses less digits than its factorization.

61154547890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548173.

The product of its (nonzero) digits is 1209600, while the sum is 50.

The spelling of 61154547890 in words is "sixty-one billion, one hundred fifty-four million, five hundred forty-seven thousand, eight hundred ninety".