1221061650626 has 4 divisors (see below), whose sum is σ = 1831592475942. Its totient is φ = 610530825312.

The previous prime is 1221061650617. The next prime is 1221061650629. The reversal of 1221061650626 is 6260561601221.

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., 750189838225 + 470871812401 = 866135^2 + 686201^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1221061650626.

It is not an unprimeable number, because it can be changed into a prime (1221061650629) by changing a digit.

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 as a sum of consecutive naturals, namely, 305265412655 + ... + 305265412658.

Almost surely, 2^{1221061650626} is an apocalyptic number.

1221061650626 is a deficient number, since it is larger than the sum of its proper divisors (610530825316).

1221061650626 is an equidigital number, since it uses as much as digits as its factorization.

1221061650626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610530825315.

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 1221061650626 in words is "one trillion, two hundred twenty-one billion, sixty-one million, six hundred fifty thousand, six hundred twenty-six".