1667915540 has 12 divisors (see below), whose sum is σ = 3502622676. Its totient is φ = 667166208.

The previous prime is 1667915539. The next prime is 1667915549. The reversal of 1667915540 is 455197661.

It can be written as a sum of positive squares in 2 ways, for example, as 734735236 + 933180304 = 27106^2 + 30548^2 .

It is a super-3 number, since 3×1667915540³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1667915491 and 1667915500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1667915549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41697869 + ... + 41697908.

It is an arithmetic number, because the mean of its divisors is an integer number (291885223).

Almost surely, 2^1667915540 is an apocalyptic number.

1667915540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1667915540 is an abundant number, since it is smaller than the sum of its proper divisors (1834707136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1667915540 is a wasteful number, since it uses less digits than its factorization.

1667915540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83395786 (or 83395784 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 44.

The square root of 1667915540 is about 40840.1216942359. The cubic root of 1667915540 is about 1185.9271681722.

The spelling of 1667915540 in words is "one billion, six hundred sixty-seven million, nine hundred fifteen thousand, five hundred forty".