1662525381 has 16 divisors (see below), whose sum is σ = 2496227328. Its totient is φ = 975087600.

The previous prime is 1662525373. The next prime is 1662525437. The reversal of 1662525381 is 1835252661.

It is not a de Polignac number, because 1662525381 - 2³ = 1662525373 is a prime.

It is a super-2 number, since 2×1662525381² = 5527981284938390322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662525331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 811551 + ... + 813596.

It is an arithmetic number, because the mean of its divisors is an integer number (156014208).

Almost surely, 2^1662525381 is an apocalyptic number.

1662525381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1662525381 is a deficient number, since it is larger than the sum of its proper divisors (833701947).

1662525381 is a wasteful number, since it uses less digits than its factorization.

1662525381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1625192.

The product of its digits is 86400, while the sum is 39.

The square root of 1662525381 is about 40774.0773163538. The cubic root of 1662525381 is about 1184.6482796001.

The spelling of 1662525381 in words is "one billion, six hundred sixty-two million, five hundred twenty-five thousand, three hundred eighty-one".