61221560354 has 4 divisors (see below), whose sum is σ = 91832340534. Its totient is φ = 30610780176.

The previous prime is 61221560341. The next prime is 61221560359. The reversal of 61221560354 is 45306512216.

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

It can be written as a sum of positive squares in only one way, i.e., 40737367225 + 20484193129 = 201835^2 + 143123^2 .

It is not an unprimeable number, because it can be changed into a prime (61221560359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15305390087 + ... + 15305390090.

Almost surely, 2^61221560354 is an apocalyptic number.

61221560354 is a deficient number, since it is larger than the sum of its proper divisors (30610780180).

61221560354 is a wasteful number, since it uses less digits than its factorization.

61221560354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30610780179.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 61221560354 in words is "sixty-one billion, two hundred twenty-one million, five hundred sixty thousand, three hundred fifty-four".