1220662157 has 18 divisors (see below), whose sum is σ = 1452892266. Its totient is φ = 1024314720.

The previous prime is 1220662129. The next prime is 1220662181. The reversal of 1220662157 is 7512660221.

It can be written as a sum of positive squares in 3 ways, for example, as 132388036 + 1088274121 = 11506^2 + 32989^2 .

It is not a de Polignac number, because 1220662157 - 2¹⁰ = 1220661133 is a prime.

It is a super-2 number, since 2×1220662157² = 2980032203063785298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220662117) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9398 + ... + 50295.

It is an arithmetic number, because the mean of its divisors is an integer number (80716237).

Almost surely, 2^1220662157 is an apocalyptic number.

It is an amenable number.

1220662157 is a deficient number, since it is larger than the sum of its proper divisors (232230109).

1220662157 is a wasteful number, since it uses less digits than its factorization.

1220662157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59741 (or 59717 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 1220662157 is about 34937.9758572245. The cubic root of 1220662157 is about 1068.7230106062.

The spelling of 1220662157 in words is "one billion, two hundred twenty million, six hundred sixty-two thousand, one hundred fifty-seven".