1550697643 has 6 divisors (see below), whose sum is σ = 1704485972. Its totient is φ = 1409725020.

The previous prime is 1550697587. The next prime is 1550697667. The reversal of 1550697643 is 3467960551.

It is not a de Polignac number, because 1550697643 - 2⁹ = 1550697131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1550697593 and 1550697602.

It is not an unprimeable number, because it can be changed into a prime (1550691643) 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 in 5 ways as a sum of consecutive naturals, for example, 6407721 + ... + 6407962.

Almost surely, 2^1550697643 is an apocalyptic number.

1550697643 is a deficient number, since it is larger than the sum of its proper divisors (153788329).

1550697643 is a wasteful number, since it uses less digits than its factorization.

1550697643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12815705 (or 12815694 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 46.

The square root of 1550697643 is about 39378.8984482806. The cubic root of 1550697643 is about 1157.4681309887.

The spelling of 1550697643 in words is "one billion, five hundred fifty million, six hundred ninety-seven thousand, six hundred forty-three".