1025401664 has 28 divisors (see below), whose sum is σ = 2325465504. Its totient is φ = 439457664.

The previous prime is 1025401661. The next prime is 1025401681. The reversal of 1025401664 is 4661045201.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025401661) 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, 1143974 + ... + 1144869.

Almost surely, 2^1025401664 is an apocalyptic number.

1025401664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1025401664 is an abundant number, since it is smaller than the sum of its proper divisors (1300063840).

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

1025401664 is an equidigital number, since it uses as much as digits as its factorization.

1025401664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2288862 (or 2288852 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 1025401664 is about 32021.8935105343. The cubic root of 1025401664 is about 1008.3965224218.

Adding to 1025401664 its reverse (4661045201), we get a palindrome (5686446865).

The spelling of 1025401664 in words is "one billion, twenty-five million, four hundred one thousand, six hundred sixty-four".