1606551001 has 6 divisors (see below), whose sum is σ = 1765878506. Its totient is φ = 1460500800.

The previous prime is 1606550987. The next prime is 1606551029. The reversal of 1606551001 is 1001556061.

It can be written as a sum of positive squares in only one way, i.e., 1028869776 + 577681225 = 32076^2 + 24035^2 .

It is not a de Polignac number, because 1606551001 - 2¹¹ = 1606548953 is a prime.

It is a super-2 number, since 2×1606551001² = 5162012237628204002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1606551091) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6638520 + ... + 6638761.

Almost surely, 2^1606551001 is an apocalyptic number.

1606551001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1606551001 is a deficient number, since it is larger than the sum of its proper divisors (159327505).

1606551001 is a wasteful number, since it uses less digits than its factorization.

1606551001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13277303 (or 13277292 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 1606551001 is about 40081.8038640977. The cubic root of 1606551001 is about 1171.2011919111.

The spelling of 1606551001 in words is "one billion, six hundred six million, five hundred fifty-one thousand, one".